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Acmispon strigosus

Higher Taxonomy
Family: Fabaceae (Leguminosae)View DescriptionDichotomous Key

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

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 strigosus (Nutt.) Brouillet
Habit: Annual, often fleshy, strigose or not. Stem: prostrate, often mat-forming, generally branched from base, 0.3--5 dm. Leaf: irregularly pinnate; stipules gland-like, black; leaflets 4--9, 3--10 mm, oblanceolate to obovate; axis flat, +- blade-like. Inflorescence: 1--2-flowered, peduncle 3--25 mm, generally bracted. Flower: calyx 3--5.5 mm, lobes < tube, +- strigose; corolla 5--10 mm, opening or not, yellow, orange or +- red in age, wings generally > keel; stigma glabrous or puberulent. Fruit: dehiscent, erect or spreading, 1--3.5 cm, linear, generally curved near tip, generally flat, margin not wavy; beak curved, 0.5--1.5 mm. Seed: 5--10. Chromosomes: 2n=14.
Ecology: Coastal scrub, chaparral, foothills, deserts, roadsides, other disturbed areas; Elevation: < 2300 m. Bioregional Distribution: GV, CW, SW, D; Distribution Outside California: Arizona, Mexico. Flowering Time: Mar--Jun Note: Several variants often recognized (see Isely, pp. 193--198); plants in CA-FP generally +- strigose, with narrow leaflets; plants in D fleshy, generally canescent, with wide leaflets. Conspicuous in spring.
Synonyms: Lotus strigosus (Nutt.) Greene; Lotus strigosus var. hirtellus (Greene) Ottley; Lotus strigosus var. tomentellus (Greene) Isely; Lotus tomentellus Greene; Acmispon strigosus (Nutt.) D.D.Sokoloff var. hirtellus (Greene) D.W. Taylor
eFlora Treatment Author: Luc Brouillet
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botanical illustration including Acmispon strigosus


Citation for this treatment: Luc Brouillet 2017. Acmispon strigosus, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on October 21, 2017.

Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora,, accessed on October 21, 2017.

Acmispon strigosus
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© 2009 Gary A. Monroe
Acmispon strigosus
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© 2009 Steve Matson
Acmispon strigosus
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© 2008 Keir Morse
Acmispon strigosus
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© 1997 Christopher L. Christie
Acmispon strigosus
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© 2014 Keir Morse
Acmispon strigosus
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© 2009 Thomas Stoughton

More photos of Acmispon strigosus in CalPhotos

Geographic subdivisions for Acmispon strigosus:
GV, CW, SW, D;
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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.