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Vascular Plants of California
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Trifolium longipes subsp. atrorubens

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: TrifoliumView DescriptionDichotomous Key

Common Name: CLOVER
Habit: Annual, perennial herb, unarmed. Leaf: generally palmately compound; stipules conspicuous, partly fused to petiole, generally papery or membranous; leaflets generally 3, occasionally 5--9, +- toothed or wavy. Inflorescence: raceme (generally umbel-like), head, or spike, axillary or terminal, generally many-flowered, generally involucred, generally peduncled; inflorescence bracts 0 or forming vestigial ring or involucre; flower bracts present or not. Flower: generally spreading to erect, generally becoming reflexed; corolla generally purple to pale lavender, occasionally yellow, persistent after flower; 9 filaments fused, 1 free. Fruit: generally indehiscent but generally breaking, short, plump, generally enclosed in corolla; base generally stalk-like. Seed: 1--6.
Etymology: (Latin: 3 leaves)
eFlora Treatment Author: Michael A. Vincent
Reference: Foster & Vincent 2018 Madroño 65:141--150; Morgan et al. 2014 Novon 23:65--69; Tressel et al. 2022 Madroño 69:327--340; Vincent & Gillett 2023 FNANM 11(2):914--974
Unabridged Reference: Gillett 1980 Canad J Bot 58:1425--1448; Zohary & Heller 1984 Genus Trifolium; Ellison et al. 2006 Mol Phylogen Evol 39:688--705
Species: Trifolium longipesView Description 

Habit: Perennial herb, rhizomed or not, cespitose or not, generally puberulent. Stem: decumbent to erect, occasionally +- 0. Leaf: basal and cauline; stipules < 2 cm, lance-oblong to ovate; leaflets 2--5 cm, linear to obovate. Inflorescence: head-like, included or exserted, 1.5--3 cm wide; peduncle generally bent or curved at tip; pedicels 1--2 mm. Flower: calyx 5--10 mm, +- puberulent, lobes generally > tube, lanceolate to bristle-like; corolla 10--18 mm, dull white, purple, or 2-colored. Fruit: stalk-like base 0--1 mm. Seed: generally 1. Chromosomes: 2n=16,24,32,48.

Unabridged Note: Characters generally difficult on herbarium sheets; Trifolium longipes subsp. longipes not in California.
Trifolium longipes Nutt. subsp. atrorubens (Greene) J.M. Gillett
Habit: Roots thickened, fusiform; rhizomes +- 0. Leaf: leaflet short-elliptic, obtuse, length 2.5--6 × width. Inflorescence: pedicels 0.3--1 mm; flowers spreading to ascending. Flower: calyx lobes 1--3 × tube, densely long-hairy; corolla white to purple.
Ecology: Dry or boggy meadows, open slopes, woodland, subalpine; Elevation: 1100--3000 m. Bioregional Distribution: NCoRH, SN, SnBr, SnJt. Flowering Time: Jun--Sep
Synonyms: Trifolium longipes var. atrorubens (Greene) Jeps.; Trifolium rusbyi var. atrorubens Greene
Jepson eFlora Author: Michael A. Vincent
Reference: Foster & Vincent 2018 Madroño 65:141--150; Morgan et al. 2014 Novon 23:65--69; Tressel et al. 2022 Madroño 69:327--340; Vincent & Gillett 2023 FNANM 11(2):914--974
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

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Citation for this treatment: Michael A. Vincent 2023, Trifolium longipes subsp. atrorubens, in Jepson Flora Project (eds.) Jepson eFlora, Revision 12,, accessed on July 19, 2024.

Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora,, accessed on July 19, 2024.

No expert verified images found for Trifolium longipes subsp. atrorubens.

Geographic subdivisions for Trifolium longipes subsp. atrorubens:
NCoRH, SN, SnBr, SnJt.
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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 occurrence).


Data provided by the participants of the  Consortium of California Herbaria.

View all CCH records
All markers link to CCH specimen records. The original determination is shown in the popup window.
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.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.

CCH collections by month Flowering-Fruiting Monthly Counts

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 (fruiting time in some monocot genera).