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Acmispon rigidus

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: AcmisponView DescriptionDichotomous Key

Common Name: DEERVETCH, DEERWEED
Habit: Annual, perennial herb, shrub, unarmed. Leaf: generally odd-1-pinnate (or +- palmately compound, rarely some or most simple); stipules often gland-like, bump-like, or conic, often not apparent; leaflets 3--9, generally irregularly arranged, lowest not stipular in position. Inflorescence: umbel or 1--2-flowered, axillary, generally peduncled, often bracted. Flower: corolla generally yellow (white, pink), fading darker; 9 filaments fused, 1 free. Fruit: dehiscent or not, exserted from calyx or not, ovoid to oblong, +- beaked. Seed: 1--several.
Species In Genus: +- 23 species: southwestern Canada, western United States, Mexico, 1 sp. in Chile. Etymology: (Greek acme, point, apex, probably for the hooked-tipped fruit) Note: Intermediates may be hybrids.
Unabridged Note: Pollen has 4(7) apertures.
eFlora Treatment Author: Luc Brouillet

Acmispon rigidus (Benth.) Brouillet
NATIVE
Habit: Perennial herb, shrub-like, finely strigose. Stem: ascending, clustered, branched, (2)5--15 dm. Leaf: irregularly pinnate to +- palmate, well spaced; stipules gland-like or 0; leaflets 3--5, 5--17 mm, oblanceolate to obovate, length > 3 × width; axis (including petiole) 1--8 mm, not flat. Inflorescence: 1--3-flowered, peduncle 20--60(130) mm, bract near top, small or 0. Flower: calyx 5.5--10 mm, lobes < tube, finely strigose; corolla 12--24 mm, yellow to cream, wings > keel; stigma +- glabrous. Fruit: slowly dehiscent, spreading or erect, much exserted, 2--4 cm, linear, +- straight, generally flat, generally glabrous; beak curved, 0.5--1.5 mm. Seed: 18--30. Chromosomes: 2n=14.
Ecology: Chaparral, desert flats, washes, foothills; Elevation: < 1550 m. Bioregional Distribution: PR, D; Distribution Outside California: to southeastern Utah, Arizona, Baja California. Flowering Time: Mar--May
Synonyms: Lotus rigidus (Benth.) Greene
eFlora Treatment Author: Luc Brouillet
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Citation for this treatment: Luc Brouillet 2016. Acmispon rigidus, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=91720, accessed on February 06, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 06, 2016.


Acmispon rigidus
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© 1998 Christopher L. Christie
Acmispon rigidus
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© 2004 Aaron Schusteff
Acmispon rigidus
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© 2012 Keir Morse
Acmispon rigidus
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© 2011 Neal Kramer
Acmispon rigidus
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© 2003 Michael Charters
Acmispon rigidus
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© 2012 Keir Morse

More photos of Acmispon rigidus in CalPhotos


Geographic subdivisions for Acmispon rigidus:
PR, D;
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.