274 PROCEEDINGS OP THE AMERICAN ACADEMY 



on the other hand, this appendage is present in the original Calan- 

 drinia {caiilescens) and a good part of the other annual species, is 

 developed even into an arillus in one of our perennial species, and 

 is more or less conspicuous nearly throughout Claytonia and Montia. 

 Indeed, Bonpland describes it in his Claytonia Cubensis, i. e. C. per- 

 foliata. 



It will be seen that Lewisia, instead of being quite anomalous in the 

 order, is very closely related to Calandrinia, that is, to its thick-rooted 

 species ; and that these species all have the basally circumscissile dehis- 

 cence of the capsule, which vpas supposed to be peculiar to Lewisia. 



PORTULACA. The three flat-leaved species remain as character- 

 ized by Dr. Eugelmaun in PI. Lindheimerian£e. Of the terete-leaved 

 species we seem to have four which may on the whole be distin- 

 guished, viz. : — 



P. STELLiFORMis, Mo9ino & Sesse : perennial by creeping tuberous- 

 thickened and sometimes moniliform rootstocks : leaves quite terete, 

 an inch long, those involucratiug the flower-cluster radiating and much 

 sui'passing it : axillaiy clusters of hairs short and soft : petals copper- 

 or buff-color, obcordate : seeds blackish, granulate-tuberculate, with 

 metallic lustre. For the name see DC. Prodr. iii. 353. It is fairly 

 represented, in the Ic. Fl. Mex. ined. Caiques, t. 389, and is the P. 

 suffrutescens, Engelm. in Bot. Gazette, vi. 326; but it is not sufFru- 

 tescent. Plains of W. Texas to Arizona and Mexico. 



P. HALIMOIDES, L, : a fleshy-rooted perennial, yet flowering as an 

 annual : leaves short and flattish, with copious axillary hair : petals 

 yellow : capsule-lid depressed and much shorter than the basal por- 

 tion : seeds granulose, reddish, at least when young. Keys of Florida 

 and W. Indies. 



P. PILOSA, L. : annual, the base often indurating in age: leaves 

 nearly terete, linear-subulate, half or quarter inch long, with copious 

 hair in axils : petals carmine, crimson, or purple, a line or two long, 

 retuse : capsule-lid hemispherical : seeds blackish and with metallic 

 lustre, muriculate-granulose. Florida to Arizona, and widely dispersed 

 over warm regions. 



P. PARVULA. Annual, but sometimes fleshy-rooted, depressed and 

 diffuse: leaves nearly terete, oblong-linear, obtuse, 2 to 5 lines long, 

 copiously hairy in the axils : petals yellow and copper-colored, barely 

 a line long: lid high hemispherical, fully as long as basal part of the 

 capsule : seeds pale red, minutely granulate. This is a part of P. pilosa. 

 Gray, PI. Fendl., PI. Wright., &c., was collected by Wright and by 

 Fendler on the plains of W, Texas and New Mexico, and in Mexico 

 by Schaff'ner (772), Pringle (543), &c. 



