244 



LEGUMIXOSAE 



Herb; leaves with several pairs of pinnae 1. H. densiflora. 



Shrub; leaves with only one pair of pinnae besides the terminal pisna 2, H. microphylla. 



1. H. densiflora Benth. Camote de Raton. (Fig. 177.) Stems few or sev- 

 eral from deep-seated roots, 2 to 12 inches high, with a tuft of mostly basal leaves; 

 leaves bipinnate, 3 to 5 inelies long, with commonly 3 to 5 pairs of pinnae, the pin- 

 nae 3 to 9 lines long ; leaflets oblong, 1 to 3 lines long ; flowers 5 lines long ; corolla 

 orange-red; lower margins of petals and the claws with many stipitate glands; 

 filaments puberulent, the alternate ones less heavy or glandular than the others; 

 ovary densely covered with tack-shaped glands; pods % to l^/^ inches long, straight 

 on the ventral suture. 



Hard alkaline spots, 500 to 2000 feet : head of the San Joaquin Valley; Mohave 

 and Colorado deserts. South to Lower California and Mexico, east to Texas. 

 Apr. -June. 



Note on migration. — In Southern California Hoffmanseggia densiflora appears to be migrat- 

 ing to some extent, more especially entering cultivated areas. Parish (Bull. S. Cal, Acad. 19*: 19) 

 records its appearance at Alhambra in 1896 and it has been collected at Los Angeles by T. 

 Minthorn, in 1909. In 1922 W. S. Childs writes: "it is spreading rapidly over our cultivated 

 fields at Brawley". Along the highway from Desert Center to Blythe, Hoffmanseggia keeps 

 close to the road, suggesting its recent spread there from interstate traffic by highway vans. 

 Doubtless, too, the Eosedale station in the San Joaquin Valley resulted from human agency. 



Locs. — Rosedale, Kern Co., Davy 2928; Barnwell, 

 J. JV. Connor, Jepson 5465; Piute Creek, e. Mohave 



Desert, N. C. Wilson; Blythe, Palo Verde Valley, Jep- » •* ^x=^ CM ^ 111 



son 5265; Palm Springs of San Jacinto, Peirson : San " ^ /-v^^lWi^^ M 



Felipe, S. B. 4- W. F. Parish 1410; Imperial, F. H. 

 Wales ; BTavr]cy, W. S. Childs. H ,7^=^' I 'X X'^WW yllf/f f/'^ 



Eefs. — Hoffmanseggia densiflora Benth. ; Gray, 

 PI. Wright. 1:55 (1852), type loc. vallev of the Pecos, 

 Tex., Wright; Jepson, Man. 516 (1925). E. striata 

 Benth.; Gray, I.e. 1:56, type loc. Zacatecas, Mex., Coul- 

 ter. Larrca densiflora Britt. N. Am. Fl. 23:311 (1930) . 

 H. falcaria of Mo. Bull. Cal. Dept. Agr. 13 :167 (1924). 



2. H. microphylla Torr. (Fig. 178). Bush 

 2 to 10 feet high, with rusli-like stems; leaves 

 % to 11/4 inches long, with one pair of lateral 

 pinnae 2 to 5 lines long, the terminal pinna 

 twice as long; racemes 4 to 5 inches long; flow- 

 ers 4 lines long ; filaments hairy at base ; ovary 

 with its margins and style densely hairy; pods 

 oblong-falcate, 8 to 9 lines long. 



Desert flats or banks of washes, 100 to 

 4000 feet: Inyo Co.; Colorado Desert. South 

 to Lower California and Sonora, east to Ari- 

 zona. Apr. 



Locs. — Independence, Peirson ; Shavers Well, J. T. 

 Howell 3307; Painted Canon, n. of Mecca, Jepson 

 11,634; Dos Palmas; Coachella, Greata 428; Indio, 

 Davy 7936; Palm Sprs. of San Jacinto, Parish 4114; 

 Carrizo Creek, T. Brandegee; Calexico, Davy 8001. 



Eefs.— HoFFiiANSEGGiA MICROPHYLLA Torr. Bot. Mex. Boxmd. 58 (1859), type loc. Colorado 

 Desert, Schott; Jepson, Man. 516 (1925). Larrea microphylla Britt. N. Am. Fl. 23:310 (1930). 



9. THERMOPSIS R. Br. 



Perennial herbs (resembling Lupinus) with commonly erect clustered stems. 

 Leaves palmately 3-foliolate, petioled, and with free leaf-like stipules. Flowers 

 yellow, in a terminal raceme, the pedicels subtended by persistent bracts. Calyx 

 campanulate, deeply toothed, the two upper teeth in ours almost completely united. 



Fig. 178. HOFFMAXSEGGIA MICRO- 

 PHYLLA Torr. a. fl. branchlet, X ^ ; 

 h, long. sect, of fl., X 3 ; c, stamen, X 

 5 ; d, pod, X 1. 



