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false thelododium, long-leaf mock thelypody

Stems

simple or few from base, 4–15 dm, pubescent proximally, trichomes simple and long-stalked, 2-rayed, mixed with smaller, dendritic ones.

Basal leaves

caducous;

petiole to 3 cm;

blade spatulate to oblanceolate, 1.8–3 cm × 2–4 mm, margins dentate, sinuate, incised, or runcinate, surfaces pubescent, trichomes stalked, forked and dendritic, mixed with fewer, simple ones.

Cauline leaves

(distal) sessile;

blade linear, 3–9.2 cm × 0.8–5 mm, surfaces glabrous or glabrate.

Racemes

secund, 1.6–7.9dm in fruit.

Flowers

(slightly zygomorphic, receptacle asymmetric);

sepals purple or green, oblong, 4–9 × 1.5–4 mm, (adaxial largest);

petals lavender to purple apically, spatulate, (4–)5–7(–12) × 1–3 mm, (adaxial largest);

filaments 4–9 mm;

anthers 1–1.2(–2) mm.

Fruiting pedicels

slightly descending, recurved, 5–13 mm.

Fruits

pendent, straight or nearly so, 5–10 cm × 1–1.2 mm, slightly latiseptate;

valves glabrous;

septum transparent;

ovules 150–250 per ovary;

style 0.5–1.2 mm.

Seeds

biseriate, plump, not winged, oblong, 0.7–1.3x 0.4–0.5 mm;

seed coat mucilaginous when wetted;

cotyledons incumbent.

2n

= 16.

Pennellia longifolia

Phenology Flowering Jul–Oct.
Habitat Mixed pine-oak forest, limestone hills, rocky outcrops and meadows, stream banks, shaded ravines
Elevation 1400-3400 m (4600-11200 ft)
Distribution
from FNA
AZ; NM; TX; Mexico; Central America (Costa Rica, Guatemala)
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 7, p. 560.
Parent taxa Brassicaceae > tribe Halimolobeae > Pennellia
Sibling taxa
P. micrantha, P. tricornuta
Synonyms Streptanthus longifolius, Heterothrix longifolia, Lamprophragma longifolium, P. hunnewellii, P. mcvaughii, Thelypodium anisopetalum, Thelypodium longifolium
Name authority (Bentham) Rollins: Rhodora 62: 16. (1960)
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