1. Gleditsia aquatica Marsh. Water or swamp locust. Fig. 497. 



Tree to 20 m. tall or rarely shrubby, spiny; leaves pinnate to bipinnate; leaf- 

 lets 12 to 18, ovate-oblong, 2-3 cm. long, usually rounded to emarginate at apex, 

 slightly crenulate and often entire below the middle, glabrous except for a few 

 hairs on the petiolules; bipinnate leaves with 6 or 8 pinnae; petioles pubescent on 

 the edges of the grooves; flowers in axillary racemes 7-10 cm. long; pedicels 

 short; floral cup campanulate; sepals equal or subequal, free; petals 3 to 5, sub- 

 equal, 4-5 mm. long, very narrow, yellowish or greenish-yellow, the uppermost 

 internal in bud; stamens 3 to 10, the filaments free; ovary glabrous; pod ovate 

 to elliptic, 2.5-5 cm. long, flattened, long-stipitate; seeds 1 or 2, not embedded in 

 packing tissue. 



Scattered in swamps, along rivers and in low bottomland forests, e. and s.e. 

 Tex., May-June; cen. U.S. to Fla. and Tex. 



4. HofEmanseggia Cav. Rush-pea 



About 40 species in America and South Africa. The genus is sometimes in- 

 cluded in Caesalpinia. 



1. HofFmanseggia glauca (Ort.) Eifert. Hog-potato, camote-de-raton. 



Stem 1-3 dm. high, glabrous or puberulent; stipules ovate; petiole and rachis 

 glandular; pinnae 5 to 11; leaflets 5 to 1 1 pairs, oblong to obovate, glabrous or 

 puberulent, 3-8 mm. long; inflorescence terminal, glandular, pubescent, 1-2 dm. 

 long, 5- to 15-flowered; bracts ovate, caducous; pedicels 2-5 mm. long; calyx 

 pubescent and glandular, its oblong lobes 6-7 mm. long; petals 10-12 mm. long, 

 with long glandular claws; stamens shorter than the petals, glandular and pubes- 

 cent; pod falcate, 2-4 cm. long, 4-8 mm. broad, glandular, glabrous or puberu- 

 lent, reticulate-veined; seeds 4 to 8. Hoffmanseggia falcaria Cav., H. densifiora 

 Gray, Larrea densifiora (Gray) Britt. 



Along roadsides and in hard alkaline soils, especially where periodically flooded, 

 in w. Okla., w. Tex., N. M. (widespread) and Ariz. (Navajo to Mohave, s. to 

 Graham, Cochise, Pima and Yuma cos.), Mar.-Sept.; cen. and s.w. U. S. to 

 Mex. and w. S.A. A highly variable species. 



According to Kearney and Peebles, "The tuberous enlargements of the roots 

 make valuable hog feed, and after roasting were used for food by the Indians." 

 Although the plant is a good soil binder, it can become a troublesome weed in 

 pastures and cultivated fields because of its habit of forming large colonies by 

 an underground root system. 



5. Lupinus L. Bluebonnet 



A genus of perhaps 200 species in the temperate regions of both hemispheres; 

 not in Africa nor Australia. 



1. Lupinus Kingsii Wats. 



Annual or possible biennial; stems 5-20 cm. tall, branched near base, erect 

 to widely spreading, silky-villous with spreading often tawny hairs; leaflets 1-3 

 cm. long, oblanceolate to oblong-lanceolate, silky-villous; raceme dense and sub- 

 capitate, seldom over 2 cm. long; peduncles variable but flower cluster shorter 

 to somewhat longer than the leaves; calyx ciliate, the lips subequal, 4-7 mm. 

 long; corolla 7-10 mm. long, purplish or blue; fruit ovate to rhombic-ovate, 

 about 1 cm. long, not noticeably constricted between the 2 seeds, villous. 



In mud and wet soil at edge of lakes, ponds and in meadows, also in dryish 

 soils, in N. M. (Grant, McKinley and Socorro cos.) and Ariz, (widespread), 

 June-Sept.; also Colo, and Ut. 



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