148 PROCEEDINGS OF THE AMERICAN ACADEMY 



on the margin of the hairy disk ; filaments slender : fruit tomentose, two 

 lines long; cells 2-seeded : seeds oblong, terminated above by a wing 

 as long as the seed. — Spircea Calif ornica, Torr. in Emory's Rep. 140. 

 V. cori/mbosa, Torr. in Bot. Mex. Bound. 64. On the Sierra Verde, near 

 the southern boundary of Arizona, by Schott on the Mexican Boundary 

 Survey, and probably the same as that collected previously by Emory on 

 high mountains near the Gila. The original species, V. corymbosa, Cor- 

 rea in Humb. & Bonpl. 1*1. G^quin. 1. 140, t. 40, from Central Mexico, 

 differs according to the description and figure in its larger and more 

 deeply serrate nearly glabrous leaves, which are on petioles as long as 

 the blade and with numerous fine parallel nerves, in its calyx naked 

 within, and its 15 to 20 stamens. The embryo in the present species 

 is without albumen, the cotyledons flat, radicle straight and inferior. 



'' PoTEXTiLLA Wheeleri. Small and subalpine, decumbent, silky- 

 villous : stems short, branched and flowering from near the base, leafy : 

 leaves digitate, 3-5-foliolate ; leaflets cuneate, 3-5-toothed at the rounded 

 summit, half an inch long or less ; stipules entire or nearly so : lower 

 flowers axillary : calyx with obtusish bractlets a little smaller than the 

 lobes : petals obcordate, nearly two lines long, slightly exceeding the 

 calyx : stamens 20 : carpels 20 : styles filiform. — Collected by ' Dr. 

 J. T. Rothrock, in the southern Sierra Nevada, about the head-waters 

 of Kern River, at 8,200 feet altitude. 



"^ HoRKELiA PDKPURASCENS. Pubescent and somewhat villous, six 

 inches high : leaflets numerous, approximate, 2-4-parted ; segments 

 oblong to obovate, two or three lines long or less ; flowers few, rather 

 large, in an open cyme : calyx purplish, about four lines long ; bractlets 

 small and narrow : petals rose-colored, broadly cuneate-oblong, nearly 

 equalling the calyx-lobes : stamens 20, in two rows ; the filaments 

 opposite to the calyx-lobes and bractlets subulate, the alternate ones 

 filiform : carpels 25, on a nearly naked receptacle. — Collected by Dr. 

 J. T. Rothrock, on the head-waters of Kern River, at 9,000 feet alti- 

 tude. An unmistakable Horkelia, but like H. trideniata intermediate 

 between the typical species and those of Ivesia, leaving it almost im- 

 possible to preserve the latter genus distinct. Specimens of H. triden- 

 iata have been recently found with decidedly deltoid filaments, showing 

 that this character may fail even to be specific. 



