Flora of North America species comparison

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Tropaeolum

Tropaeolum majus

nasturtium

common nasturtium, garden-nasturtium, Indian cress, nasturtium
Habit Plants trailing, 15–100(–250) cm; glabrous or glabrate.
Leaves

blade orbiculate or reniform [palmately lobed or divided].

petiole 5–25 cm;

blade with ca. 9 veins radiating from petiole, 3–10(–12) cm diam., abaxial surface usually papillose.
Pedicels

axillary.

6–13(–18) cm.
Flowers

relatively large, torus cupuliform.

2.5–6 cm diam.;

sepals light brown, oblong-lanceolate, 1.5–2 × 0.5–0.7 cm;

spur straight or slightly curved, 2.5–3.5 cm;

petals yellow, orange, purple, maroon, creamy white, or varicolored, mostly rounded, apex sometimes acuminate or emarginate, proximal 3 petals 2 × 2 cm, distal 2 petals usually entire, 2.5–5 × 1–1.8 cm, claw to 1.5 cm, claw margin deeply fringed;

stamens 0.5–0.6 mm;

anthers 0.5 mm;

style 0.5–0.6 cm;

stigmas 0.6–0.9 mm.
Fruits

oblate, 1.5–2 cm diam.
Seeds

5–8 mm diam. 2n = 28.
x

= 14.

Tropaeolum

Tropaeolum majus
Phenology Flowering (May-)Jun–Oct, fruiting Jul–Oct.
Habitat Disturbed roadsides, waste places, coastal bluffs, upper edges of beaches
Elevation 0-200 m [0-700 ft]
Distribution
from USDA
Mexico; Central America; South America [Introduced in North America; introduced also in Europe, Asia, Africa, Australia]
[BONAP county map]
from FNA
CA; CT; MA; NH; NY; PA; South America [Introduced in North America; introduced also in Europe, Asia, Africa, Australia]
[WildflowerSearch map]
[BONAP county map]
Discussion

Species ca. 90 (1 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Tropaeolum majus is frequently cultivated and often escapes; thoroughly naturalized and an invasive in coastal California, it occurs as a waif elsewhere.

Tropaeolum majus is often planted in gardens, and dozens of cultivars are available in the horticultural trade. Leaves of this plant have a peppery flavor and can be added to salads and sandwiches, and the flowers can be used to decorate salads and other dishes. The foliage is rich in vitamin C, and the plant also has diuretic and antibacterial properties. The plant is also used to treat wounds and infections of the urinary tract, and for problems associated with the respiratory tract (e.g., bronchitis and flu). Benzyl isothiocyanate, which can cause irritation, is responsible for the antibiotic action. The common name, Indian cress, refers to its cultivation in India.

Tropaeolum minus Linnaeus, T. peltophorum Bentham, T. peregrinum Linnaeus, and T. tuberosum Ruiz & Pavón also are cultivated in North America, but none is reported escaped. Tropaeolum tuberosum is the source of the root crop añu (ysaño), an important staple in the Andes.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 7, p. 166. FNA vol. 7, p. 166.
Parent taxa Tropaeolaceae Tropaeolaceae > Tropaeolum
Subordinate taxa
T. majus
Name authority Linnaeus: Sp. Pl. 1: 345. (1753): Gen. Pl. ed. 5, 162. (1754) Linnaeus: Sp. Pl. 1: 345. (1753)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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