Pennellia micrantha

(A. Gray) Nieuwland

Amer. Midl. Naturalist 5: 224. 1918.

Basionym: Streptanthus micranthus A. Gray Mem. Amer. Acad. Arts, n.s. 4: 7. 1849
Synonyms: Heterothrix micrantha (A. Gray) Rydberg Pennellia robinsonii Rollins Thelypodium longifolium var. catalinense M. E. Jones Thelypodium micranthum (A. Gray) S. Watson
Treatment appears in FNA Volume 7. Treatment on page 560.

Stems simple or several from base, 2–12.3 dm, pubescent proximally, trichomes predominantly dendritic, mixed with simple and long-stalked, 2-rayed ones, glabrous or sparsely pubescent distally, trichomes dendritic. Basal leaves caducous; petiole 0.5–4 cm; blade oblanceolate, (1–)3–5 cm × 6–34 mm, margins sinuate, lobed, dentate, or, rarely, subentire, surfaces pubescent, trichomes dendritic. Cauline leaves (distal) subsessile; blade oblanceolate, 3–10 cm × 1–20 mm, surfaces glabrous or glabrate. Racemes not secund, 1.5–6.7 dm in fruit. Fruiting pedicels slightly erect to divaricate-ascending, straight, (3–)3.5–8.5(–11) mm. Flowers: sepals purple or green, broadly oblong, 2.7–4 × 1.2–2 mm; petals purplish apically, spatulate to oblanceolate, 1.5–4(–5) × 0.5–2.2 mm; filaments 0.9–2.6mm; anthers 1–1.2 mm. Fruits erect to ascending, straight, (1.5–)2.2–5.8 cm × 0.6–1.8 mm, terete; valves glabrous or sparsely pubescent; septum transparent; ovules 90–140 per ovary; style obsolete to 0.5 mm. Seeds biseriate or uniseriate, plump, not winged, oblong, 0.7–0.8 × 0.4–0.5 mm; seed coat mucilaginous when wetted; cotyledons incumbent.

Phenology: Flowering Jun–Sep.
Habitat: Pine-oak forests, open grasslands, rolling andesitic loam soils, among volcanic rocks, igneous cliffs
Elevation: 1100-3600 m


V7 899-distribution-map.gif

Ariz., N.Mex., Tex., Mexico (Chihuahua, Coahuila, Distrito Federal, Durango, state of México, Michoacán, Querétaro, San Luis Potosí, Sonora).


Selected References


Lower Taxa

... more about "Pennellia micrantha"
Sara Fuentes-Soriano +  and Ihsan A. Al-Shehbaz +
(A. Gray) Nieuwland +
Streptanthus micranthus +
Ariz. +, N.Mex. +, Tex. +, Mexico (Chihuahua +, Coahuila +, Distrito Federal +, Durango +, state of México +, Michoacán +, Querétaro +, San Luis Potosí +  and Sonora). +
1100-3600 m +
Pine-oak forests, open grasslands, rolling andesitic loam soils, among volcanic rocks, igneous cliffs +
Flowering Jun–Sep. +
Amer. Midl. Naturalist +
Heterothrix micrantha +, Pennellia robinsonii +, Thelypodium longifolium var. catalinense +  and Thelypodium micranthum +
Pennellia micrantha +
Pennellia +
species +