Despite some visual similarities in their long, fibrous stalks, celery and rhubarb are not in the same plant family. Celery belongs to the Apiaceae family, often called the carrot or parsley family, while rhubarb is a member of the Polygonaceae family, also known as the buckwheat family. This fundamental botanical difference leads to distinct characteristics in their growth, flavor, nutritional profiles, and culinary uses, making them unique plants in the garden and kitchen.
Understanding these botanical distinctions is crucial for anyone who grows, cooks, or simply enjoys these popular vegetables. While both offer unique health benefits and culinary versatility, their family trees tell a story of separate evolutionary paths and specialized adaptations.
Unpacking the Apiaceae Family: Celery’s True Home
The Apiaceae family, formerly known as Umbelliferae, is a diverse group of aromatic flowering plants. This family includes many well-known culinary herbs and vegetables, such as carrots, parsley, fennel, dill, and parsnips. Members of the Apiaceae family typically share several key characteristics.
Plants in this family are mostly annual, biennial, or perennial herbs. They often have furrowed stems with hollow internodes and alternate compound leaves with sheathing bases. A defining feature is their distinctive flower arrangement, known as an umbel inflorescence, where small flowers radiate from a single point like the spokes of an umbrella. Many Apiaceae plants contain aromatic oils in their stems, petioles, and fruits, which contribute to their distinctive scents and flavors.
Where Does Celery Fit In?
Celery, scientifically known as Apium graveolens, is a prime example of the Apiaceae family. It is a biennial plant, typically cultivated as an annual, grown primarily for its crisp, juicy stalks. Wild celery, often called “smallage,” has a more coarse and earthy taste, but cultivation has led to milder, sweeter varieties.
The celery plant produces long, fibrous stalks that are crunchy and have a mild, slightly peppery flavor. These stalks are the most commonly consumed part in the United States, enjoyed raw in salads and snacks or cooked in various dishes. Celery leaves and seeds are also used for flavoring.
Common Celery Varieties
There are several types of celery cultivated for different uses. The most common in the US is stalk celery or Pascal celery, known for its thick, upright green stalks. Other varieties include leaf celery (or Chinese celery), which has thinner, more aromatic stalks and is grown primarily for its leaves, and celeriac (celery root), cultivated for its swollen, edible root.
Some popular stalk celery varieties include ‘Tall Utah’, ‘Conquistador’, and ‘Monterey’. For those seeking different colors, varieties like ‘Chinese Pink’ celery offer a vibrant hue.
Exploring the Polygonaceae Family: Rhubarb’s Botanical Roots
The Polygonaceae family is informally known as the knotweed or buckwheat family in the United States. This family includes about 1,200 species across roughly 48 genera, with a global distribution, particularly diverse in the North Temperate Zone. Members of this family typically consist of herbs, but some trees, shrubs, and vines also exist.
A distinctive feature of most Polygonaceae members is the presence of ochrea, a papery or leaf-like sheath that surrounds the stem at the base of each leaf petiole. Their leaves are usually simple and arranged alternately along the stem. Many species also exhibit swollen nodes on their stems, which is hinted at by the family name “Polygonum,” meaning “many knees” or “many joints” in Greek.
Where Does Rhubarb Fit In?
Rhubarb, specifically edible garden rhubarb (Rheum rhabarbarum), is a hardy perennial belonging to the Polygonaceae family. It is known for its thick, fleshy, tart stalks, which are the edible part of the plant. The plant grows from large, fleshy rhizomes, and its large, heart-shaped basal leaves emerge in early spring.
Rhubarb has a long history, with ancient Chinese cultures using it medicinally over 5,000 years ago. While botanically classified as a vegetable, rhubarb is often treated culinarily as a fruit, especially in the United States, due to its common use in desserts.
The Critical Warning: Rhubarb Leaves are Toxic
It is paramount to understand that rhubarb leaves are toxic and should never be consumed. They contain high levels of oxalic acid and anthrone glycosides, which can cause severe health issues, including kidney damage and even be lethal in very large quantities. While the stalks also contain oxalic acid, the concentration is much lower and considered safe for consumption.
During World War I, rhubarb leaves were mistakenly recommended as a food substitute, leading to instances of poisoning and deaths. As a general safety measure, always remove and discard rhubarb leaves before preparing the stalks.
Common Rhubarb Varieties
Rhubarb varieties are often distinguished by the color of their stalks, ranging from red to green to speckled pink. While many prefer red-stalked types for their appearance, color does not necessarily indicate sweetness. Green varieties can be equally productive and delicious.
Popular rhubarb cultivars include ‘Canada Red’, known for its tender, sweet, red stalks; ‘Cherry Red’, with long, thick, rich red stalks; and ‘Victoria’, a speckled type producing medium-sized stalks. ‘Crimson Red’ is another favorite, particularly in the Pacific Northwest.
Are Celery and Rhubarb in the Same Family? A Definitive Comparison
To reiterate, celery and rhubarb unequivocally belong to different plant families. Celery is in the Apiaceae family, while rhubarb is in the Polygonaceae family. This botanical separation is a key differentiator, influencing everything from their genetic makeup to their physical characteristics and chemical composition.
Dr. Eleanor Jones, a botanist specializing in plant taxonomy, explains, “While both celery and rhubarb are herbaceous plants often consumed as stalks, their fundamental genetic blueprints are entirely distinct. The presence of an ochrea in rhubarb and its absence in celery is just one visible indicator of their separate evolutionary histories and distinct classifications.”
The following table outlines the key differences between celery and rhubarb:
| Feature | Celery (Apium graveolens) | Rhubarb (Rheum rhabarbarum) |
|---|---|---|
| Plant Family | Apiaceae (Carrot/Parsley Family) | Polygonaceae (Buckwheat Family) |
| Botanical Classification | Vegetable | Vegetable (often used culinarily as a fruit) |
| Edible Parts | Stalks, leaves, seeds, roots (celeriac) | Stalks (petioles) only; leaves are toxic |
| Taste Profile | Mild, slightly earthy, sometimes subtly peppery | Very tart, sour |
| Typical Culinary Use | Savory dishes, raw snacks, soups, salads | Sweetened in desserts, pies, jams, sauces |
| Growth Habit | Biennial (grown as annual), herbaceous | Perennial, herbaceous |
| Key Physical Feature | Furrowed, hollow stems, compound leaves, umbel flowers | Large basal leaves, thick petioles, presence of ochrea (sheath at leaf base) |
| Primary Nutrients | Vitamins K, C, A, folate, potassium, fiber, water | Vitamins K, C, A, calcium, potassium, fiber, antioxidants |
Understanding the Distinct Differences and Similarities
While celery and rhubarb are not botanically related, they share some superficial similarities that often lead to confusion. Both plants have long, ribbed stalks that are crisp when raw. Their stalks are also popular in culinary applications, though their flavors and uses diverge significantly.
Beyond these surface-level commonalities, the differences are profound. Celery leaves are edible and often used in cooking for flavor, whereas rhubarb leaves are critically toxic due to high concentrations of oxalic acid. This distinction is vital for home cooks and gardeners. “Always remember: celery leaves, yes; rhubarb leaves, absolutely not,” advises Sarah Peterson, a certified nutritionist and avid gardener.
More on Distinct Differences
Their growth habits differ, with celery being a biennial usually grown as an annual, completing its life cycle in one to two years. Rhubarb is a true perennial, returning year after year from its robust root system. The taste profiles are another major difference; celery offers a mild, slightly savory, and herbaceous flavor, while rhubarb is intensely tart and requires significant sweetening for most culinary uses.
Furthermore, their preferred growing conditions also vary. Celery thrives in long, cool growing climates with consistent moisture. Rhubarb is exceptionally hardy and tolerant of cold, making it a staple in northern climates, emerging early in spring.
Nutritional Profiles: What Each Brings to Your Table
Both celery and rhubarb are low in calories and rich in essential vitamins, minerals, and dietary fiber, contributing to a healthy diet. However, their specific nutrient compositions offer different benefits.
Celery’s Nutritional Benefits
Celery is approximately 95% water, making it an excellent choice for hydration. A cup of chopped celery provides about 14 calories and 1.6 grams of fiber. It is a good source of Vitamin K, important for blood clotting and bone strength, and also contains Vitamin A, Vitamin C, potassium, and folate.
Celery also contains antioxidants and phytonutrients that help reduce inflammation and support heart health. Its fiber content aids in digestion and promotes gut health. “Celery is more than just a crunchy vehicle for dips; its high water content, fiber, and diverse micronutrients make it a fantastic everyday vegetable for overall well-being,” says dietitian Allie Wergin.
Rhubarb’s Nutritional Benefits
Rhubarb is also very low in calories, with a half-cup serving containing around 13 calories. It is particularly high in Vitamin K, providing more than a third of the recommended daily intake in one cup, which is crucial for bone health and blood clotting. Rhubarb is also a good source of Vitamin C, Vitamin A, calcium, potassium, and manganese.
Rich in antioxidants like anthocyanins (which give red rhubarb its color) and proanthocyanidins, rhubarb offers anti-bacterial, anti-inflammatory, and anti-cancer properties. These antioxidants may also help protect against heart disease and support healthy cholesterol levels. The fiber in rhubarb also contributes to digestive health.
Here is a comparison of their key nutritional values per 100 grams (raw):
| Nutrient (per 100g raw) | Celery | Rhubarb |
|---|---|---|
| Calories | 14 kcal | 21 kcal |
| Water Content | ~95% | ~94% |
| Carbohydrates | 3 g | 4.54 g |
| Fiber | 1.6 g | 1.8 g |
Culinary Applications and Best Practices
The distinct flavors and textures of celery and rhubarb lead to very different culinary applications. Understanding these uses is key to making the most of each ingredient.
Celery in the Kitchen
- Raw: Celery stalks are a popular snack, often paired with dips or peanut butter. They add a refreshing crunch to salads like Waldorf salad or chicken salad.
- Cooked: Celery is a foundational ingredient in mirepoix (with onions and carrots) for soups, stews, and casseroles. It softens and sweetens slightly when cooked, adding depth of flavor without overpowering other ingredients. Braised celery can also be a delicious side dish.
- Flavoring: Celery leaves can be used as a garnish or herb, and celery seeds are a common spice in rubs, pickles, and bloody marys.
When selecting celery, look for firm, crisp stalks that snap easily. Store it in the refrigerator, ideally wrapped in foil or submerged in water, to maintain freshness and crispness.
Rhubarb in the Kitchen
- Desserts: Rhubarb shines in pies, crumbles, crisps, and tarts, often combined with sweeter fruits like strawberries or apples. Its tartness provides a delightful contrast to sugar.
- Sauces and Jams: Cooked rhubarb makes excellent compotes, sauces, and jams, perfect for topping yogurt, pancakes, or ice cream.
- Savory Dishes: Although less common, rhubarb can be used in savory applications, such as chutneys, marinades, or sauces for rich meats, where its acidity cuts through fattiness.
When buying rhubarb, choose firm, crisp stalks with good color. Always remember to discard the leaves entirely before cooking. Rhubarb can be stored in the refrigerator for about a week or chopped and frozen for longer preservation.
FAQ Section
Can you substitute celery for rhubarb?
No, you cannot generally substitute celery for rhubarb due to their vastly different flavor profiles and culinary uses. Celery is mild and savory, while rhubarb is intensely tart and typically used in sweet dishes.
Are celery and rhubarb related?
No, celery and rhubarb are not related. They belong to entirely different plant families: celery is in the Apiaceae family, and rhubarb is in the Polygonaceae family.
What are the main differences between celery and rhubarb?
The main differences include their botanical families, edible parts (celery stalks and leaves are edible, rhubarb stalks only), flavor (mild for celery, very tart for rhubarb), and primary culinary uses (savory for celery, sweet for rhubarb).
Is rhubarb a vegetable or a fruit?
Botanically, rhubarb is a vegetable. However, in the United States, it is often treated as a fruit for culinary purposes, especially when used in pies and desserts.
Is celery a root vegetable?
While one variety, celeriac, is grown for its bulbous root, the common celery (stalk celery) consumed in the US is typically grown for its stalks, not its root.
Can I eat rhubarb leaves?
No, you must never eat rhubarb leaves. They contain high levels of oxalic acid, which is toxic and can cause serious illness or even death. Only the stalks are safe to consume.
Conclusion
The culinary world is full of delightful diversity, and celery and rhubarb stand as excellent examples of this. Though they might share a superficial resemblance in their stalk-like form, their botanical classifications reveal them to be distinct entities. Celery, a member of the Apiaceae family, offers mild, savory notes and refreshing crunch, while rhubarb, from the Polygonaceae family, provides a vibrant tartness, primarily for sweet applications. Understanding these differences, from their genetic roots to their nutritional benefits and proper preparation, enhances both our appreciation and safe enjoyment of these unique and beneficial plants.
Disclaimer: The information provided in this article is for general knowledge and informational purposes only, and does not constitute medical advice. Always consult with a qualified healthcare professional before making any decisions about your diet or health. Rhubarb leaves are toxic and should never be consumed. Exercise caution and seek immediate medical attention if rhubarb leaves are accidentally ingested.
