Thelypodium howellii |
Thelypodium eucosmum |
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Howell's thelypody |
arrow-leaf thelypody, world thelypody |
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Habit | Biennials or, rarely, perennials; (short-lived); glaucous, glabrous (except petioles). | Biennials or perennials; (short-lived); glaucous, glabrous (except petioles). | ||||
Stems | branched distally, 1–8(–9.3) dm. |
branched distally, 2–10 dm. |
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Basal leaves | petiole 0.5–2 cm, ciliate; blade often oblanceolate to spatulate, sometimes oblong or lanceolate, 2–10(–13.5) cm × 10–23(–40) mm, margins often lyrate to dentate, sometimes entire or repand. |
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. |
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Cauline leaves | (ascending); sessile; blade often lanceolate to linear, sometimes oblong, (0.8–)1–9.7(–14.5) cm × 2–10(–30) mm, (base usually amplexicaul to strongly sagittate, rarely auriculate), margins entire. |
(ascending); sessile; blade lanceolate to oblong, 1.8–4.5(–6) cm × 5–16(–24) mm, (base amplexicaul to strongly auriculate), margins entire. |
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Racemes | lax, elongated in fruit, (flower buds ovate to lanceolate). |
lax, slightly elongated in fruit, (flower buds oblong-linear). |
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Flowers | sepals erect, linear or lanceolate, (3.5–)5–8.5(–11.5) × (0.7–)1–2(–2.5) mm; petals lavender to purple, linear or oblanceolate to spatulate, (6–)9–16.5(–22) × 0.5–2.7(–3) mm, margins partially crisped, claw differentiated from blade, [slender, (2.5–)4–7(–11) mm, narrowest at base]; nectar glands confluent, subtending bases of stamens; filaments slightly tetradynamous, median pairs (3–)5.5–9(–12) mm, lateral pair (2.5–)4.5–8(–10) mm; anthers slightly exserted to included, linear, (1.5–)2–4(–5.5) mm, not circinately coiled; gynophore (stout), 0.5–1(–3.5) mm. |
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. |
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Fruiting pedicels | usually ascending, rarely divaricate-ascending, usually straight, rarely slightly incurved, stout, (2.5–)3.5–8(–14.5) mm, not flattened at base. |
horizontal to divaricate, usually straight, rarely slightly incurved, slender, (2.5–)3–5.5(–6.5) mm, slightly flattened at base. |
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Fruits | often ascending, sometimes erect or divaricate, slightly torulose, straight or slightly incurved (forming straight line with pedicel), terete, 1.5–6.5(–8.2) cm × 1–1.3(–2) mm; ovules 22–40 per ovary; style cylindrical or subclavate, (0.5–)1–2.7(–4.3) mm. |
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. |
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Seeds | (1–)1.2–1.7(–2) × 0.5–0.7 mm. |
0.7–1.5 × 0.5–0.8 mm. |
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Thelypodium howellii |
Thelypodium eucosmum |
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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 |
CA; OR; WA
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OR
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Discussion | Subspecies 2 (2 in the flora). Streptanthus howellii (S. Watson) M. E. Jones is a later homonym of S. howellii S. Watson 1885. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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.) |
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Key |
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Source | FNA vol. 7, p. 732. | FNA vol. 7, p. 731. | ||||
Parent taxa | Brassicaceae > tribe Thelypodieae > Thelypodium | Brassicaceae > tribe Thelypodieae > Thelypodium | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Cartiera howellii, Thelypodiopsis howellii | |||||
Name authority | S. Watson: Proc. Amer. Acad. Arts 21: 445. (1886) | B. L. Robinson: in A. Gray et al., Syn. Fl. N. Amer. 1(1,1): 175. (1895) | ||||
Web links |