384 COMPOSITiE. 



3 Hues high, narrow; bracts of the iuvolucre linear-subulate: rays 15—40, 

 bluish-purple. — Common in moist subsaline or alkaline soil. Aug. — Oct. 



24. LEUCOSYRIS. Glabrous pale glaucescent perennial, woody at 

 base, tbe intricately branched reedy stems nearly leafless, the branchlets 

 terminating each in a small head of white flowers. Involucre campan- 

 ulate or turbinate, of lanceolate acute chartaceous bracts regularly 

 imbricated in about 3 series. Rays wanting. Style-appendages linear- 

 subulate. Achenes terete, silky-pubescent. 



1. L. carnosa. Lmosyris carnosa, Gray, PI. Wright, ii. 80 (1853); 

 Bigelovia intricala, Gray, Proc. Am. Acad. xvii. 208 (1882); Aster carnosus, 

 Gray, Syn. Fl. 202 (1884). Tufted reedy pale-green stems 2-3 ft. high; 

 the sparse lower leaves linear, very fleshy, entire, 1 in. long or less, those 

 of the branches reduced to subulate scales: heads scattered, 3 — 4 lines 

 high. — In subsaline moist ground from Tulare Co., Cungdon, and Kern 

 Co., Greene, southward and eastward. 



25. LEUCELENE, Greene. Low perennials, the tufted leafy stems 

 (in our species mouocephalous) from a lignescent base or rootstock. 

 Leaves small, ascending, oblong-linear or lanceolate, rigid, entire. In- 

 volucres turbinate, or campanulate, imbricated, the bracts narrow, 

 nearly plane, with narrow scarious margins and without herbaceous 

 tips. Eays white or purple. Disk-corollas tubular-funnelform, 5- 

 toothed. Style-appendages (in our species) subulate-linear. Achenes 

 compressed, pubescent. Pappus double, an inner series of bristles and 

 an inconspicuous outer one of squamellse. 



1. L. alpiua. Chrysopsis alpina, Nutt. Journ. Acad. Philad. vii. 34, 

 t. 3, fig. 2 (1834). Aster scopulorum, Gray, Proc. Am. Acad. xvi. 98 

 (1880). Stems tnfted, rigid, only a few inches high, bearing a single 

 peduncled head: leaves 3-2 in- long or more, scabro-puberulent, callous- 

 margined and mucronate: rays % in. long, deep violet. — At middle 

 altitudes of the eastern slope of the Sierra, in dry rocky soil. 



26. OREASTRUM, Greene. Stemless perennials, with narrow sub- 

 coriaceous leaves and scapiform mouocephalous branches from a some- 

 what fusiform or branched tap-root. Bracts of involucre narrow, 

 subequal, in about 2 series. Rays purple, rather numerous. Disk- 

 corollas yellow, tubular-funnelform, with 5 erect teeth. Style-branches 

 filiform, hirsutulous. Achenes subterete, 5— 8-costate. Pappus uni- 

 serial, bristly, barbellate scabrous, brownish. 



