Psorothamnus schottii (Torr.) Barneby
Dalea schottii Torr.
Dalea schottii Torr. var. puberula (Parish) Munz
Indigo Bush, Schott Indigobush, Schott's Dalea, Schott’s dalea
Schott’s delea is native to western North America. They prefer gravelly to sandy slopes, benches, and washes, at elevations below 1969' (600 m).
Plants: Large, densely branched spiny shrubs, reaching 10' (3 m). Branches are dotted with glands.
Leaves: ½-1" (1.3-2.5 cm) long and only ¹/₁₆" (1.6 mm) wide, essentially needles, blue-gray or green, covered with very minute hairs that make them appear whitish. Sometimes they are in groups of two or three.
Flowers: Deep purple-blue, pea-shaped, ¼-⅜" (7-10 mm) across, in groups of 5-20 flowers.
Fruits: Roughly egg-shaped, ¼-⅜" (7-10 mm) long, with raised dark red spots.
Psorothamnus schottii on CalPhotos
Psorothamnus schottii at the Virginia Tech Department of Forest Resources and Environmental Conservation
Psorothamnus schottii at the Lady Bird Johnson Wildflower Center
Psorothamnus on www.worldbotanical.com
Psorothamnus schottii from the Jepson Manual
These similar species are most easily distinguished by leaf shape:
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|Plant||Large shrub or small tree, heavily branched, irregular in shape, spiny, up to 20' (6.1 m) tall.||Large, densely branched spiny shrub, reaching 10' (3 m).|
|Flowers||Dark purple to deep blue, pea-shaped flowers, ¼-⁵/₁₆" (6.3-8.3 mm) across, in loose clusters.||Deep purple-blue, pea-shaped flowers, ¼-⁵/₁₆" (6.3-8.3 mm) across, in loose 4-inch-long clusters.|
|Leaves||Nearly leafless, but has small bluish-gray wedge-shaped leaves that are widest near the top, ¼" (8.5 mm) long.||Needle-shaped, ½-1" (1.3-2.5 cm) long and only ¹/₁₆" (1.6 mm) wide, blue-gray or green.|
|Fruit||Roughly egg-shaped, ¼" (8.3 mm) long, one end pointed, with dark red spots.||Fruits are roughly egg-shaped, ¼" (8.3 mm) long, with raised dark red spots.|
|Habitats||Creosote bush scrub|
Psorothamnus schottii description by Thomas H. Kent, last updated 25 May 2020.