Flora of North America species comparison

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Thelypodium eucosmum

arrow-leaf thelypody, world thelypody
Habit Biennials or perennials; (short-lived); glaucous, glabrous (except petioles).
Stems

branched distally, 2–10 dm.
Basal leaves

petiole (0.9–)1.4–3(–4.5) cm, ciliate;

blade usually oblanceolate to oblong or lanceolate, rarely ovate or elliptic, (2.8–)3.5–8.8(–11) cm × (7–)10–25(–35) mm, margins often entire or repand, sometimes sinuate.
Cauline leaves

(ascending);

sessile;

blade lanceolate to oblong, 1.8–4.5(–6) cm × 5–16(–24) mm, (base amplexicaul to strongly auriculate), margins entire.
Racemes

lax, slightly elongated in fruit, (flower buds oblong-linear).
Flowers

sepals erect, linear-oblong, 5–7(–8) × (0.8–)1–1.5(–1.8) mm;

petals dark purple, spatulate to oblanceolate, (6.6–)7.5–10(–11.5) × 1–1.8(–2) mm, margins not crisped, claw differentiated from blade, [slender, (3–)3.5–5(–5.5) mm, narrowest at base];

nectar glands confluent, subtending bases of stamens;

filaments subequal, (4.5–)6–9(–10) mm;

anthers exserted, linear to narrowly oblong, 2.5–4(–4.5) mm, circinately coiled;

gynophore (1–)2.5–6(–7.5) mm.
Fruiting pedicels

horizontal to divaricate, usually straight, rarely slightly incurved, slender, (2.5–)3–5.5(–6.5) mm, slightly flattened at base.
Fruits

divaricate to ascending, torulose, straight or slightly incurved, terete, (2–)2.4–5(–6.5) cm × 0.7–1(–1.3) mm;

ovules 44–58 per ovary;

style usually cylindrical, rarely subclavate, 0.5–1.5(–2) mm.
Seeds

0.7–1.5 × 0.5–0.8 mm.

Thelypodium eucosmum
Phenology Flowering May–Jul.
Habitat Shady slopes and canyons, pinyon-juniper and oak woodland communities, stream beds, streamsides
Elevation 700-1000 m (2300-3300 ft)
Distribution
from FNA
OR
[WildflowerSearch map]
[BONAP county map]
Discussion

Of conservation concern.

Thelypodium eucosmum is known only from Baker, Grant, and Wheeler counties. It is in the Center for Plant Conservation’s National Collection of Endangered Plants.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 7, p. 731.
Parent taxa Brassicaceae > tribe Thelypodieae > Thelypodium
Sibling taxa
T. brachycarpum, T. crispum, T. flexuosum, T. howellii, T. integrifolium, T. laciniatum, T. laxiflorum, T. milleflorum, T. paniculatum, T. repandum, T. rollinsii, T. sagittatum, T. stenopetalum, T. texanum, T. wrightii
Name authority B. L. Robinson: in A. Gray et al., Syn. Fl. N. Amer. 1(1,1): 175. (1895)
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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