Chorizanthe. 



rOLYGONACE.'E. 



33 



7. CHORIZANTHE, R. Brown. 

 Involucres 1 - 3-flowered, sessile, tubular, coriaceous or chartaceous, more or less 

 reticulated or corrugated, 3 - 6-angled or -costate and 3 - G-toothed or -cleft, the 

 teeth cuspidate or rigidly awned. Flowers pedicellate or nearly sessile, included 

 in the involucre or rarely exserted, 6-parted or -cleft. Stamens 9, rarely 3 or G. 

 Bractlets minute or usually obsolete. Ovary glabrous and akene triangular. In 

 other respects as Eriogonum. — Low dichotomously branched annuals (tlie (Jhilian 

 species mostly perennial), with usually rosulate radical leaves, and ternate bracts. — 

 Torr. & Gray, in Proc. Am. Acad. viii. 192. Watson, Proc. Am. Acad. xii. 2G9. 

 Chorizanthe & Mucronea, Benth, Acanthogoimvij Torr. Centrostegia, Gray. 



The species, as in Eriogonum, vary much in habit and other characters, and ai-e grouped into 

 several sections which have been regarded as genera. Centrostegia is here also incliulecl, as too 

 closely connected with Mucronea to be separated I'rom it. Besides the following, nine species are 

 found in Chili, ])erennials with a single exception. The characters are not always obvious, and 

 it will be noticed that several species are known from only a single locality or collector. 



Glabrous or glandular, not villous nor tomentose : bracts foliaceous, " 



connate : flowers 6-parted, soft-jnibescent : stamens 9, at the base. 

 Involucres 1 -3-flowered, spurred at base : bracts small. 

 Spuis 3, broad, straight : teeth short and broad. 

 Spurs 4 to 6, awn-like, hooked : teeth narrow, attenuate. 

 Involucres 1- flowered, not spurred : bracts conspi(uious. 



Sparingly hirsute : bracts perfoliate : perianth-segments laciniate. 

 More hirsute : bracts unilateral : segments entire. 

 Villous-pubescent or hirsute, not glandular : bracts not connate : in- 

 volucres 1-flowered, 6-toothed : flowers 6-cleft (6-parted in n. 5): 

 stamens mostly 9, inserted below the middle. 

 Involucres capitate-glomerate ; teeth mostly more or less scarious- 

 margined : stems usually leafy and bracts foliaceous. 

 Teeth united by a scarious petaloid margin : erect : heads few. 

 Floccose-tomeutose, slender, lca,y : leaves linear : margin broadly 



dilated : flowers ]iedicelled, pubescent : lobes spatulate. 

 Hirsute : leaves oblanceolate : margin narrower : flowers glabrous, 

 Sessile, '2^ lines long : lobes obcordate : leaves scattered. 

 Nearly sessile, a line long ; lobes truncate, the outer cuspidate, 

 inner retuse : leaves in 1 or 2 whorls. 

 Teeth distinct : usually more ditt"use and decumbent, villous-pubes- 

 cent : heads more numerous. 

 Decumbent, slender : involucres and flowers 1 to 1^ lines long. 

 Leaves narrow : bracts acerose : teeth long-awned, scarious ; 



flowers a line long. 

 Leaves ovate : bracts foliaceous : teeth short, the sinus scari- 

 ous : flowers 1| lines long. 

 Leaves oblanceolate : bracts foliaceous : teeth scarious : flowers 

 Ij lines long : lobes equal. 

 Stout, erect : bracts foliaceous : involucres and flowers 2 to 2^ 

 lines long. 

 Teeth equal, straight : perianth-lobes oblong, entire. 

 One tooth long-awned ; margin none : lobes broad, the shorter 

 retuse, laciniate. 

 Involucres in looser cymes or scattered, not scariously margined : 

 leaves all radical. 

 Perianth-lobes lanceolate, fringed : bracts not foliaceous. 

 Lobes coarsely fringed below the obtuse summit. 

 Lobes finely fringed, long-acuminate. 

 Perianth-lobes oblong, entire. 

 Bracts not foliaceous. 



Leaves oblong, tomentose beneath : flowers pinkish, 2 lines 



long : lobes oblong, unequal. 

 Leaves si)atulate, not tomentose : flowers yellow, \\ lines long : 

 lobes equal, nari'ow. 



5. C. MEMBRAXACE.V. 



6. C. STELLULATA. 



7. C. DOUGLASII. 



8. C. DIFFUSA. 



9. C. Brkweki. 



