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arrow thelypody, slender thelypody

Habit Biennials or perennials; (short-lived); sometimes glaucous, glabrous throughout or sparsely to densely pubescent.
Stems

branched often proximally and distally, (2–)3–8(–12.5) dm, (glabrous or pubescent).

Basal leaves

petiole (1–)2–8(–14) cm, ciliate;

blade usually oblanceolate to ovate, rarely oblong, (2–)6.5–20(–29) cm × 10–42(–50) mm, margins entire, (surfaces glabrous or pubescent).

Cauline leaves

(ascending);

sessile;

blade lanceolate to oblong-lanceolate, (0.8–)1.6–8.5(–14) cm × 2–13(–28) mm, (base amplexicaul to sagittate), margins entire, (surfaces glabrous or pubescent).

Racemes

sometimes corymbose, lax or dense, elongated or not in fruit, (flower buds ovate to lanceolate).

Flowers

sepals erect, ovate to oblong, (2.5–)3–6(–10) × (1–)1.5–2(–2.5) mm;

petals white or lavender to purple, oblanceolate to spatulate or linear, (5–)7–14(–19) × (0.5–)1–3(–4) mm, margins slightly crisped between blade and claw, claw differentiated from blade, [slender, (2–)3–6.5(–10) mm, narrowest at base];

nectar glands confluent and subtending bases of stamens, sometimes only lateral;

filaments tetradynamous, median pairs 3–5.5(–8) mm, lateral pair (2–)2.5–4.5(–7) mm;

anthers included or partially exserted, oblong, (1.5–)2–3.2(–5) mm, not circinately coiled;

gynophore (stout), 0.5–1(–2) mm.

Fruiting pedicels

horizontal to divaricate, often curved upward, stout or slender, (2.5–)3.5–11(–20) mm, not flattened at base.

Fruits

erect, torulose, straight or slightly incurved (forming arc with pedicel), usually terete, rarely 4-angled, 1–5.3(–6.9) cm × (0.5–)0.8–1(–1.2) mm;

ovules 20–62per ovary;

style cylindrical, 0.5–1.5(–3.3) mm.

Seeds

(flattened), (0.7–)1–1.3(–1.5) × 0.5–0.7(–1) mm.

Thelypodium sagittatum

Distribution
from FNA
CO; ID; MT; NV; UT; WA; WY
[WildflowerSearch map]
[BONAP county map]
Discussion

Subspecies 2 (2 in the flora).

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

Key
1. Racemes often dense; fruiting pedicels 5-11(-20) mm; petals spatulate to oblanceolate, 1-3(-4) mm wide; median nectar glands often absent.
subsp. sagittatum
1. Racemes lax; fruiting pedicels (2.5-)3.5-7(-8) mm; petals linear to linear-oblanceolate, 0.5-1 (-1.5) mm wide; median nectar glands present.
subsp. ovalifolium
Source FNA vol. 7, p. 736.
Parent taxa Brassicaceae > tribe Thelypodieae > Thelypodium
Sibling taxa
T. brachycarpum, T. crispum, T. eucosmum, T. flexuosum, T. howellii, T. integrifolium, T. laciniatum, T. laxiflorum, T. milleflorum, T. paniculatum, T. repandum, T. rollinsii, T. stenopetalum, T. texanum, T. wrightii
Subordinate taxa
T. sagittatum subsp. ovalifolium, T. sagittatum subsp. sagittatum
Synonyms Streptanthus sagittatus, Pachypodium sagittatum, Thelypodiopsis nuttallii, Thelypodiopsis sagittata, Thelypodiopsis torulosa, T. nuttallii, T. torulosum
Name authority (Nuttall) Endlicher: in W. G. Walpers, Repert. Bot. Syst. 1: 172. (1842)
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