The Morton Arboretum
The Field Museum
Chicago Botanic Garden
Additional Partners
Log In
New Account
Sitemap
Home
Search Collections
Map Search
Browse Images
Inventories
Aquatic Invasive Plant Guide
Naturalized flora of The Morton Arboretum
vPlants Checklist
Chicago Region Checklists and Inventories
Interactive Tools
vPlants Dynamic Key
Dynamic Checklist
Dynamic Key
Draba pterosperma
Payson
Family:
Brassicaceae
Winged-Seed Whitlow-Grass
FNA
Resources
Ihsan A. Al-Shehbaz, Michael D. Windham, Reidar Elven in Flora of North America (vol. 7)
Perennials;
(densely cespitose to pulvinate); caudex branched (with persistent leaves, branches sometimes terminating in sterile rosettes); scapose.
Stems
un-branched, 0.3-1.1 dm, pubescent throughout, trichomes sub-dendritic, 2-7-rayed, (often crisped), 0.2-0.7 mm.
Basal leaves
(densely imbricate); rosulate; petiolate; petiole base and margin ciliate, (trichomes simple or branched, often crisped, 0.3-1 mm); blade oblanceolate to obovate or spatulate, 0.2-0.7 cm × 1-2.8 mm, margins entire, surfaces densely pubescent (often grayish) with stellate-dendritic, stalked, 5-12-rayed, (often crisped) trichomes, 0.2-0.6 mm.
Cauline leaves
0.
Racemes
4-12-flowered, ebracteate, elongated in fruit; rachis not flexuous, pubescent as stem.
Fruiting pedicels
erect (and subappressed to rachis) or ascending, straight, (3-)4-9(-12) mm, pubescent as stem.
Flowers:
sepals oblong, 3-4 mm, pubescent, (trichomes stalked, branched, crisped); petals yellow, oblanceolate, 6-7 × 1.5-2.5 mm; anthers oblong, 0.7-0.9 mm.
Fruits
broadly ovate to lanceolate or subelliptic, plane, flattened, 5-10(-13) × (2.5-)3.5-5(-6) mm; valves pubescent, trichomes short stalked, 2-7-rayed, (straight or crisped), 0.15-0.6 mm; ovules 8-12 per ovary; style 1.5-3(-3.8) mm.
Seeds
(winged), ovate, 1.6-3 × 1.3-1.8 mm; (wing 0.3-0.9 mm wide).
Flowering Jun-Sep. Limestone and marble outcrops, talus, gravel slopes; 1500-2500 m; Calif.
Draba pterosperma
is a distinctive species that is restricted to the Marble Mountains of northern California (Siskiyou County).
Open Interactive Map
Click to Display
20 Total Images