Wildflowers of Southern Arizona
Mustard (Brassicaceae) family.
Plant: Annual or biennial herb with a taproot 10 cm - 0.5 m tall. Stem: typically single from base, upright, branched in upper third (occasionally near the base), sparsely hairy. Lower leaves: reverse lance-shaped, sharp-toothed to pinnately divided or even twice pinnately divided, wilted, sparsely hairy. Upper leaves: alternate, not clasping, deep green, smaller than lower leaves, less than 1 cm wide, linear to reverse lance-shaped, bases narrowing, tips pointed, sometimes toothed, sparsely hairy. Flowers: in dense, branched clusters (raceme), which are borne laterally and terminally on the stems. Racemes numerous, to 10 cm long. Sepals four, greenish white, 1 mm long, cupped. Petals four or none, white, about 2 mm long (equal to nearly twice as long as sepals), bases narrowed. Stamens two. Anthers yellow. Fruit: a pod (silicle), green (turning brownish), 2.5 - 4 mm long, 2 - 3.5 mm wide, widely elliptic to orbicular, flattened, tips notched, tips narrowly winged. Seed one on each side. Seed: embryonic root generally at back of 1 cotyledon Misc: Habitat and ecology: A very common weed that grows in a wide variety of disturbed habitats. Look for it along roads, railroads, and woodland edges. Also grows in fields, gardens, and waste areas. < 2400 m. Flowering: May to early December.
Santa Catalina Mountains
Sabino Canyon Recreation Area
Location: Bear Canyon Road 0.6 mi from Visitor Center.
2/2/16, 2/5/16, 2/13/16
Notes: Sabino Canyon beside tram road 3/4/17
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