854 PROCEEDINGS OF THE AMERICAN ACADEMT 



leaves vary greatly in their division, from incisely toothed to very 

 deeply cleft. 



Alciiemilla veldtina. Perennial, with numerous decumbent or 

 ascending branching stems, the stems and branches appressed villous : 

 leaves glabrous or sparingly villous, cuneate, 3-cleft, 2 to 5 lines long, 

 the segments entire or 1-3-toothed ; stipules entire or usually of two 

 narrowly oblong lobes : flowers very small, the calyx covered with a 

 fine velvety pubescence.- — In swampy places about San Luis Potosi 

 (870 Schaffner). 



Rosa Mexicana. Low (about a foot high), armed with straight 

 rather slender spines (1 to 5 lines long) : stipules glandular-ciliate, and 

 the rhachis of the leaves with short stout spreading gland-bearing 

 hairs and prickly ; leaflets 5 to 7, narrow, mostly acute at each end, 

 doubly serrate, slightly pubescent and glandular beneath, 4 to 10 lines 

 long: flowers solitary, 1^ inches in diameter; calyx-lobes glandu- 

 lar-hairy, at length deciduous, the tube glabrous or very nearly so : 

 fruit globose, 3 or 4 lines in diameter. — In the Caracol Mountains, 

 Coahuila (2124). Allied to R. parvijlora. 



Crataegus pubescens, Steud. A form with broadly flabelliform 

 or rhomboidal leaves. In the mountains east of Saltillo (2123). The 

 Mexican species of this genus are somewhat obscure, but this appears 

 distinguishable from C. Mexicana by its generally acuter and more 

 acutely toothed leaves, which are less coriaceous when old. 50 Bour- 

 geau (" C Crus-galll ") is 0. Mexicana, as also 228 Parry & Palmer. 



CoTONEASTER DENTicuLATA, HBK. In the Sierra Madre south 

 of Saltillo (330) ; 230 Parry & Palmer. 



Philadelphus serptllifolius, Gray. A variety with the leaves 

 for the most part less densely pubescent beneath, similar to 1101 

 Wright. In the Sierra Madre south of Saltillo (2122'^). The species 

 is more nearly related to P. microphyllus than to P. Mexicanus. 



TiLL^A angustifolia, Nutt. Near Morales, San Luis Potosi (126 

 Schaff'ner) ; 680 Parry & Palmer. 



Cotyledon Schaffneri. Acaulescent, the basal leaves narrowly 

 lanceolate, narrowing from near the middle each way and acuminate, 



3 or 4 inches long by \ inch wide, somewhat purplish ; cauline leaves 

 rather numerous, linear, flattened, very acute, 1 to H inches long: 

 flowering stem a foot high, bearing a 2-branched raceme (the branches 



4 inches long and about 8-1 2-flovvered) ; pedicels very short : sepals 

 narrowly lanceolate, unequal, 2 to 5 lines long ; corolla yellow and 

 pink, 6 to 8 lines long, nearly twice longer than the carpels. — On 

 sandy slopes of mountains around San Luis Potosi (768 Schaff'ner). 



