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Martin F. Wojciechowski, except as noted

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.
± 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. [Lewis et al. (eds) 2005 Legumes of the World. RBG, Kew] 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. <Noxious weed>, Halimodendron halodendron (Pall.) Voss <Noxious weed> (possibly extirpated), Lens culinaris Medik. are agricultural weeds. Caragana arborescens Lam. only cultivated. Ononis alopecuroides L. <Noxious weed>, Sphaerophysa salsula (Pall.) DC. <Noxious weed> all evidently extirpated. Cercidium moved to Parkinsonia; Chamaecytisus to Cytisus; Psoralidium lanceolatum to Ladeania. —Scientific Editors: Martin F. Wojciechowski, Thomas J. Rosatti.

Key to Fabaceae

Tree, generally armed (generally unarmed in cultivation); ± dioecious. Leaf: of new stems alternate, irregularly odd-2-pinnate, of old stems on spurs, odd-1-pinnate. Inflorescence: on spurs, ± catkin-like, pendent. Staminate inflorescence: flowers clustered, pedicels 0 to short. Pistillate or bisexual inflorescence: flowers generally spaced, pedicels > short. Flower: radial, perianth hairy, sepals, petals each 3–5, ± alike except petals > sepals; stamens generally 5–7[8]. Fruit: ± indehiscent, oblong to ovate, compressed side-to-side yet plump, pulpy, dry, leathery in age. Seed: [1]many.
13–16 species: eastern North America, South America, eastern and southeastern Asia. (J.G. Gleditsch, German botanist, 1714–1786) [Randall & Meyers-Rice 1997 Madroño 44:399–400; Schnabel & Wendel 2003 Amer J Bot 90:310–320]
Unabridged species in genus: [13–16 species: 2–3 in eastern North America, 1 in South America, 8–10 in eastern and southeastern Asia.]
Unabridged references: [Gordon 1966 Ph.D. Dissertation, Indiana Univ; Schnabel & Wendel 2003 Amer J Bot 90:310–320; Randall & Meyers-Rice 1997 Madroño 44:399–400]

G. triacanthos L. HONEY LOCUST
Leaf: deciduous; 2-pinnate leaves with 1° leaflets 7–17, 2° leaflets 4–20, elliptic to oblong, 1.3–2.5 cm, glabrous; 1-pinnate leaves with leaflets 20–28, 1.5–3.5 cm. Staminate inflorescence: 1–several per spur, 3.5–8 cm, simple or branched at tip. Pistillate inflorescence: 1 per spur, 3–5 cm, simple. Flower: perianth yellow-green, ± 3 mm (staminate), 4–5 mm (pistillate flower); stamens 5–7. Fruit: 1–3 per peduncle, 20–40 cm, 2.5–3 cm wide, generally curved, often twisted, hairy in youth, brown, glabrous, shiny, persistent in age.
Uncommon. Moist riparian to dry upland woodland; < 800 m. Sacramento Valley, Peninsular Ranges, expected elsewhere; central and eastern United States, widely cultivated. May–Jun {Weed listed by Cal-IPC} [Online Interchange]

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora,, accessed on Mar 28 2015
Citation for this treatment: [Author of taxon treatment] 2013. Gleditsia, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on Mar 28 2015

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Geographic subdivisions indicated for the distribution of Gleditsia triacanthos 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.
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.