CHORIZANTHE. . 5 I 



2. C. leptocp:ras, Watson, 1. c. Procumbent, branching from the 

 base, 3-6 inches broad, smooth or glandular near the joints; radical 

 leaves narrowly spathulate, smooth, becoming revolute; cauline and 

 involucral bracts trifid, obtuse and ciliate below, accuminate-cuspidate 

 above; involucres scattered in the lower axils, cymosely clustered on 

 the upper and terminal branches, divisions 6, very imequpl, narrowly 

 linear, with prominent mid-rib, and ciliate margins terminating in slen- 

 der, straight awns, tube short-turbinate, the 6 spurs corresponding to 

 the divisions divaricately spreading, curved and sharply uncinate ; flow- 

 ers 2-3, unequally pedicellate, and exsert, villous-pubescent externally, 

 segments oblong, nearly equal; stamens 9, anthers red; styles slender; 

 akene triangular, beaked; cotyledons small, inflexed radicle slender. 



Habitat : Dry, gravelly plains near San Bernardino, May. 



* * Involucres equally 6 cleft, with conspicuous scarious margins, and reflexed 

 uncinate awns; tube protuberant-saccate (not spurred) at base; secondary flowers 

 undeveloped and inconspicuous; involucral bracts narrowly foliaceous, whorled or 

 opposite, shortly accuminate. 



3. C. MEMBRANACEA, Benth., Watson, 1. c. Erect, 6-18 inches high, 

 lanosely-pubescent when young, deciduous with age, sparingly branched 

 above, radical and lower cauhne leaves linear, obtuse, or shortly accu- 

 minate above, forming irregular whorls at the lower axils; involucres in 

 the lower axils few, without scarious margins, the upper in condensed 

 capitate heads, with equal, broadly expanded scarious winged divisions, 

 reflexed, rotate and tipped with a slender uncinate awn ; tube ribbed 

 and protuberant below; flowers 2-3, one with long pedicel partly ex- 

 sert, the others undeveloped, nearly obsolete; perianth short-tubular, 

 campanulate, hairy externally, segments oblong equal; stamens g at 

 the base, styles rather short; ovary at maturity covered with remains 

 of the perianth, and nearly filling the contracted rigid tube of the in- 

 volucre; akene broadly triangular, beaked; cotyledons thick, yellow, 

 with short inflexed radicle. 



Habitat : Rather abundantly distributed on rocky foot-hills of the 

 Sierra-Nevada. Clearly belonging to the Centrostegia section in its 

 saccate protuberant involucral tube and its long pedicellate flowers, in- 

 cluding the undeveloped ones, which have been heretofore overlooked. 



* * * Involucres unequally 4-5 cleft, one division much the longest, all with 

 straight rigid awns, tube short, costate (not saccate), varying in size, flowers 2-3, 

 with short jointed pedicels, unequally developed; cauline and involucral bracts ter- 

 nate, or opposite, slender and rigidly awned. 



