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Psorothamnus schottii
INDIGO-BUSH


Higher Taxonomy
Family: Fabaceae (Leguminosae)View DescriptionDichotomous Key
Common Name: LEGUME FAMILY
Habit: Annual to tree. Leaf: generally alternate, generally compound, generally stipuled, generally entire, pinnately veined Inflorescence: generally raceme, spike, umbel or head; or flowers 1--few in axils. Flower: generally bisexual, generally bilateral; hypanthium 0 or flat to tubular; sepals generally 5, generally fused; petals generally 5, free, fused, or lower 2 +- united into keel (see 3, Key to Groups, for banner, wings); stamens 10 or many (or [1], 5, 6, 7, 9), free or fused or 10 with 9 filaments at least partly fused, 1 (uppermost) free; pistil 1, ovary superior, generally 1-chambered, ovules 1--many, style, stigma 1. Fruit: legume, including a stalk-like base (above receptacle) or not. Seed: 1--many, often +- reniform, generally hard, smooth.
Genera In Family: +- 730 genera, 19400 species: worldwide; with grasses, requisite in agriculture, most natural ecosystems. Many cultivated, most importantly Arachis, peanut; Glycine, soybean; Phaseolus, beans; Medicago, alfalfa; Trifolium, clovers; many orns. Note: Unless stated otherwise, fruit length including stalk-like base, number of 2° leaflets is per 1° leaflet. Upper suture of fruit adaxial, lower abaxial. Anthyllis vulneraria L. evidently a waif, a contaminant of legume seed from Europe. Laburnum anagyroides Medik., collected on Mount St. Helena in 1987, may be naturalized. Ceratonia siliqua L., carob tree (Group 2), differs from Gleditsia triacanthos L. in having evergreen (vs deciduous) leaves that are 1-pinnate (vs 1-pinnate on spurs on old stems, 2-pinnate on new stems) with 2--5(8) (vs 7--17) 1° leaflets, commonly cultivated, now naturalized in southern California. Aeschynomene rudis Benth. , Halimodendron halodendron (Pall.) Voss (possibly extirpated), Lens culinaris Medik. are agricultural weeds. Caragana arborescens Lam. only cult. Ononis alopecuroides L. , Sphaerophysa salsula (Pall.) DC. all evidently extirpated. Cercidium moved to Parkinsonia; Chamaecytisus to Cytisus; Psoralidium lanceolatum to Ladeania.
eFlora Treatment Author: Martin F. Wojciechowski, except as noted
Scientific Editor: Martin F. Wojciechowski, Thomas J. Rosatti.
Genus: PsorothamnusView DescriptionDichotomous Key


Common Name: INDIGO-BUSH
Habit: Perennial herb to small tree, generally thorny, gland-dotted, especially stems, generally hairy. Stem: generally intricately branched. Leaf: simple or generally odd-1-pinnate, leaflets 1--3, generally more. Inflorescence: axillary or terminal, raceme, spike- or head-like or not; pedicel bractlets (0)2. Flower: calyx lobes generally unequal, upper 2 often largest; petals from receptacle, indigo blue to pink-purple; stamens 10, filaments partly fused; ovules generally 2. Fruit: indehiscent, included in or exserted from calyx, generally glandular. Seed: 1.
Species In Genus: 9 species: deserts of southwestern United States, Mexico, basins of Colorado Plateau. Etymology: (Greek: scabshrub)
eFlora Treatment Author: Martin F. Wojciechowski & Duane Isely
Unabridged Reference: Barneby 1977 Mem New York Bot Gard 27:21--54, 598--607
Psorothamnus schottii (Torr.) Barneby
NATIVE
Habit: Shrub < 2 m, green, gray-strigose in age. Leaf: simple (or leaflets 2--3), 1--3 cm, linear, densely puberulent, gland-dotted, persistent. Inflorescence: open, 5--20-flowered; pedicel bractlets 2. Flower: calyx 4--6 mm, lobes < tube, glabrous to +- puberulent, glands generally many, brown to +- purple; corolla 7--10 mm, deep blue, banner with +- yellow spot, glands 0. Fruit: exserted, 7--10 mm; glands spaced, large. Chromosomes: 2n=20.
Ecology: Gravelly to sandy slopes, benches, washes; Elevation: < 600 m. Bioregional Distribution: DSon; Distribution Outside California: Arizona, northwestern Mexico, Baja California. Flowering Time: Mar--May
Synonyms: Dalea schottii Torr.; Dalea schottii var. puberula (Parish) Munz; Psorodendron schottii (Torr.) Rydb.
Jepson eFlora Author: Martin F. Wojciechowski & Duane Isely
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Citation for this treatment: Martin F. Wojciechowski & Duane Isely 2012, Psorothamnus schottii, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=40164, accessed on October 15, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on October 15, 2019.

Psorothamnus schottii
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© 2012 Keir Morse
Psorothamnus schottii
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© 2012 Keir Morse
Psorothamnus schottii
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© 2010 Neal Kramer
Psorothamnus schottii
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© 2009 Aaron Schusteff
Psorothamnus schottii
click for enlargement
© 2012 Keir Morse
Psorothamnus schottii
click for enlargement
© 2012 Keir Morse

More photos of Psorothamnus schottii in CalPhotos



Geographic subdivisions for Psorothamnus schottii:
DSon
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map of distribution 1
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Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.