OF ARTS AND SCIENCES : JANUARY 26, 1870. 197 



21. C. perfoliata, Gray in Proceed. Bost. Soc. Nat. Hist. 1860. 

 Hirsutula, subglandulosa seu glabella ; foliis caulinis perfoliatis ; invo- 

 lucro tetraquetro quadridentato, dentibus breviter inoequaliter subulato- 

 aristatis ; perigonii segmentis versus apicem laciniatis. (Embryo rec- 

 tus.) — Fort Tejon, California, Xantus. On very dry rocky bills, 

 near San Luis Obispo and Mt. Oso, Brewer. " Wbole plant turning 

 bright scarlet." 



22. C. Californica, Gray, I. c. Hirsutior ; foliis caulinis am- 

 plexicaulibus, superioribus alte trilobis ; involucro compresso ssepis- 

 sime bilobo subasqualiter biaristato, rarius 3 - 4-quetro aristis additis 

 brevioribus; perigonii segmentis integerrimis. Mucronea Californica, 

 Bentb. Eriog. p. 416, t. 20. — Found, so far as we know, only by 

 Douglas, Nuttall, and Parry, and only in the vicinity of San Diego. 

 In Parry's specimens the angles and teeth of the involucre are com- 

 monly three or four. 



§ 3. Acanthogonum. Involucrum 3 - 5-dentatum seu lobatum, 

 coriaceum, tubo transverse venuloso vel corrugato, lobis inas- 

 qualibus immarginatis. Stamina 6-9, fauci perigonii 6-lobi in- 

 serta : fllamenta brevia : anthers breves. Annua?, Californica?, 

 nana?, foliis ovatis spathulatisve integris petiolatis muticis, involu- 

 cris pi. m. glomeratis. Flos in involucro pedicellatus, tenuiter 

 bracteolatus. 



The genus Acanthogonum, Torr., seemed to rest securely upon its 

 three-lobed and angled involucre, the faucial insertion of the stamens, 

 and the remarkable spiny bracts. But a second species was after- 

 wards added with a tei*ete involucre ; and now we must associate 

 with these two others which in different ways connect with Chorizanthe, 

 leaving only the character of the insertion of the stamens, — which, 

 moreover, in A. corrugatum, is not quite so high as in the others, while 

 in some Chilian species of Chorizanthe they are borne rather far up 

 on the tube. 



* Involucrum late triquetrum, tricostatum, dentibus lobisve 5: brac- 

 teae innocuae. 



23. C. polygonoides, n. sp. Diffuso-rauiosissima, depressa, laxe 

 hirsuto-pubescens ; foliis bracteisque spathulatis petiolatis muticis, 

 summisve minimis tantum mucronatis ; involucris laxius paniculato- 

 glomeratis demum induratis obpyramidato-triquetris tricostatis, lobis 3 

 triangulato-subulatis in aristam spinescentem apice subhamatam desi- 



