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Psorothamnus polydenius

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

Psorothamnus polydenius (Torr.) Rydb.
NATIVE
Habit: Shrub < 1.5 m, spreading, thorny in age, young branches, twigs finely reflexed-strigose or puberulent, with glands dense, +- 0.5 mm wide, orange. Leaf: leaflets 7--13, 1--4.5 mm, obovate to +- round, tip generally notched, terminal +- = lateral. Inflorescence: spike-like, ovate or short-cylindric, dense; pedicels < 1 mm, bractlets 0. Flower: calyx 5--6 mm, lobes unequal, +- = tube, with longitudinal rows of glands; corolla 4.5--6 mm, pink-purple, persistent after flower, banner, wings gland-tipped. Fruit: included, +- 2.5 mm. Chromosomes: 2n=20.
Ecology: Locally abundant. Desert flats, hills, washes; Elevation: 900--2250 m. Bioregional Distribution: SNE, DMoj, DSon (Imperial Co.); Distribution Outside California: to eastern Utah. Flowering Time: May--Sep
Synonyms: Dalea polydenia Torr.
eFlora Treatment Author: Martin F. Wojciechowski & Duane Isely
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Citation for this treatment: Martin F. Wojciechowski & Duane Isely 2016. Psorothamnus polydenius, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=40163, accessed on May 05, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 05, 2016.


Psorothamnus polydenius
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© 2010 Steve Matson
Psorothamnus polydenius
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© 2013 Neal Kramer
Psorothamnus polydenius
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© 1997 Gary A. Monroe
Psorothamnus polydenius
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© 2003 Larry Blakely
Psorothamnus polydenius
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© 2010 Barry Breckling
Psorothamnus polydenius
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© 2015 Steve Matson

More photos of Psorothamnus polydenius in CalPhotos


Geographic subdivisions for Psorothamnus polydenius:
SNE, DMoj, DSon (Imperial Co.);
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.