(JItorizuiilhc. 



ruLYGUx\ACE.E. 



33 



7. CHORIZANTHE, II. liiown. 



Involucres 1 - 3-llowered, sessile, tubular, coriaceous or cliartaceous, more or less 



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



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



ill the involucre or rarely exserted, G-partcd or -cleft. Stamens 9, rarely 3 or G. 



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



other respects as J'Jn'oi/onum. — Low dichotoniously branched annuals (the Chilian 



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



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



Chorizanthe & Mucronea, Uenth. Acanfho(/uman, Torr. Centrostegia, Gray. 



The species, as in Eriogonum, vary iniu.'h in habit and other characters, ami arc groujied into 

 several sections which liave been regarded as genera. Centrostegia is here also included, as too 

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

 found in Chili, jierenninls 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 fomentose : bracts foiiaccous, 

 connate : llowers 6-parteil, soft-pubcsccnt : stamens 9, at the base. 

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



Spurs 3, broad, straight : teeth short and broad. 1. C". TiiuiiBKKr. 



Spurs 4 to 6, awn-like, hooked ; teeth narrow, attenuate. 2. C. leptockhas. 



Involucres 1 -(lowered, not sj)urre(l : bracts conspicuou.s. 



Sparingly hirsute : bracts jierfoliate : iicrianth-segments laciniate. 3. C. rF,UF()LiAT.\. 

 More hirsute: bracts unilateral : segments entire. 4. C. Califok.nica. 



Villous-pubescent or hii-sute, not glandular : bracts not connate : in- 

 volucres 1-IIowered, G-toothed : llowers G-cleft (C-parted in n. [>): 

 stamens mostly 9, inserted below the middle. 

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

 margincd : stems usually leafy and bracts foliaccou.s. 

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

 Floccose-tomentose, sleniler, lealy : leaves linear: margin broadly 



dilated : flowers i)edicelled, pubescent : lobes spatulate. 

 Hirsute : leaves oblanceolate : margin narrower : (lowers glabrous. 

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

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

 inner retusc : leaves in 1 or 2 whorls. 

 Teeth distinct : usually more diffuse and decumbent, villous-pubes- 

 cent : heads more numerous. 

 Decumbent, slender : involucres and flowers 1 to H lines long, 

 heaves narrow : bracts acerosc : teeth long-awned, scarious : 



flowers a line long. 

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

 ous : flowers 1 J lines long. 9. C. Hukweki. 

 Leaves oblanceolate : bracts foliaceous : teeth scarious : flowers 



1^ lines long : lobes eipial. 10. C. ruxGEX.s. 



Stout, erect : bi-acts foliaceous : involucres and flowers 2 to 2.\ 

 lines long. 

 Teeth ecpial, straight: iterianth-lobes oblong, entire. 11. C. VAI.IUA. 



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



retuse, laciiiiate. 12. C. I'al.meri. 



Involucres in loo.scr cymes or scattered, not scarioiisly margined : 

 leaves all radical. 

 Perianth-lobes lanceolate, fringed : bracts not foliaceous. 



Lobes coars(dy fringed below the obtuse summit. 13. C. 



Lobes finely fringed, long-acuminate. 14. C". 



Perianth-lobes oblong, entire. 

 IJracts not foliaceous. 



Leaves oblong, tomentose beneath : flowers pinkish, 2 lines 



long : lobes oblong, unequal. 15. C 



Leaves spatulate, not tomentose : flowers yellow, 1| lines long : 



lobes equal, narrow. Ifi. C 



.'). r. membp.anacea. 



6. C. stellulata. 



7. C. DOUGLASII. 



8. C. DIFFl'SA. 



FIMUnrATA. 

 I.ACI.NI.VTA. 



STATICOIDES. 



