1. Lotus oblongifolius (Benth.) Greene. 



Herbaceous perennial; stems several, stout, erect or ascending from slender, 

 branched rootstocks, 1.5-4 dm. long; herbage appressed-pubescent to nearly gla- 

 brous; leaves with 7 to 11 leaflets, these linear-lanceolate to elliptic, acute, 7-20 

 mm. long, equally distributed on opposite sides of rachis, the stipules membranous; 

 peduncles exceeding the leaves in height; umbels 1- to 5-flowered, closely sub- 

 tended by a 1- to 3-foliate bract; calyx tube 2-3 mm. long, the teeth narrowly 

 subulate, about as long as the tube; petals 10-12 mm. long, the claws short and 

 little exserted from calyx, the banner yellow or orange, ovate, erect, the keel 

 and wings whitish to yellow, sometimes tinged with red; pods straight, dehiscent, 

 not beaked, remaining erect, 2.5-4 cm. long. 



Wet places at elevations of 1,000-6,000 feet, Ariz. (Cochise Co.), May-Oct.; 

 also s. Calif, and n. Mex. 



2. Lotus alamosanus (Rose) Gentry. 



Stems procumbent, slender, rooting at the nodes, glabrous or the younger parts 

 with appressed hairs; stipules 4-8 mm. long, foliaceous, ovate, acute; leaves 3- to 

 5-pinnate; leaflets obovate, obtuse, 4-10 mm. long; peduncles slender, 5-10 cm. 

 long, 1- to 4-flowered (mostly 2); bracts 1, setaceous; flowers 4-6 mm. long; 

 calyx tube less than 2 mm. long, its lobes almost as long as tube and very narrow; 

 corolla yellow; pods 2-3 cm. long, terete, erect, 12- to 15-seeded; seeds turgid, 

 oblong, lucid. 



Wet sandy soil along creeks, in seepage spring waters of canyons and in wet 

 meadows in Ariz. (Santa Cruz Co.), Apr.-May; also Son. and Dgo. 



10. Indigofera L. Indigo 



Perennial herbs, usually gray-pubescent all over, the pubescence appressed 

 with the hairs often medifixed (with 2 ends free); leaves alternate, once-impari- 

 pinnately-compound; petioles short; stipules herbaceous, subulate to setaceous; 

 leaflets 5 to 15, usually oblanceolate to obovate or elliptic, rarely linear, either 

 or not opposite on the rachis; flowers in axillary sometimes spikelike racemes; 

 calyx teeth 5; corolla papilionaceous, brick-red (less often pinkish or purplish); 

 banner orbicular or obovate, short-clawed; wings oblanceolate to oblong or linear, 

 short-clawed, slightly adherent to the keel, the blade forming a basal auricle; keel 

 petals united distally, the claws separate, the blades spurred or pouched; stamens 

 10, diadelphous, 9 with coalescent filaments, the tenth (uppermost) free, the 

 anther connective glanduliferous; pod not much if at all compressed, promptly 

 dehiscent, several-seeded, straight or falcate, linear or curvilinear; seeds usually 

 separated in the pod by partitions, not stipitate. 



A genus of about 400 species of warm regions. 



1. Mature pods with a small swollen reddish glabrous knob at the base; leaves 

 densely strigose on both surfaces 1. /. Lindheimeriana. 



1. Mature pod acute at base, without a swollen reddish knob; leaves sparsely 



strigose, the upper surface less densely so to glabrous 



2. /. suffruticosa. 



1. Indigofera Lindheimeriana Scheele. 



Erect stems 5-10 dm. tall; leaflets 7 to 15, opposite or nearly so on the rachis, 

 densely strigose on both surfaces; racemes in flower somewhat shorter than the 

 leaves but in fruit slightly longer; calyx less than half as long as the corolla, the 

 teeth lanceolate or deltoid and not or only slightly exceeding the calyx tube; pod 

 20-25 mm. long, basally with a small swollen reddish glabrous knob. 



Local in often wet alluvial soil of creeks in limestone hill areas, s. margin of 

 Edwards Plateau in Tex. from Crockett and Terrell cos. to Comal Co., May-Aug.; 

 also N. L. and Coah. 



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