206 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 



Additions and Corrections. 



After most of the manuscript of this monograph had gone through the press, ]Mr. 

 Greenman, of the Gray Herbarium, kindly submitted to me some iMexican Potentillae 

 for determination. One of these happens to be undescribed ; as it could not be printed 

 in its proper place, I append it here. 



Potentilla Oaxacana. 



Perennial from a stout tap-root ; stem 4-5 dm. high, rather densely pilose, ascending, few-leaved. 

 Basal leaves not verj- thick, rather densely pilose, less so on the upper surface ; petioles 5-7 cm. long, 

 striate, silky-villous ; leaflets 5, broadly obovate, coarsely crenate, about 5 cm. long, strongly veined ; 

 stem leaves smaller, -with 3 leaflets, the lower short-petioled, the uppermost sessile. Lower stipules 

 lanceolate, more or less scarious, the upper broadly ovate, herbaceous, and often toothed. Cyme 

 rather open. Flowers about 15 mm. in diameter. Hypanthium pilose : bractlets oblong, nearh' equal- 

 ling the ovate sepals. Petals yellow, oboA^ate, exceeding the sepals by fully one-half. Stamens 20-25. 



It belongs to the gracilis group, and is intermediate between P. fadigiata, P. subeoriacea and P. 

 staminea. It most resembles the first in the form and the pubescence of the leaves, but is a larger 

 plant, with more open cyme, larger flowers and denser pubescence. P. subcoriacea is easily distinguished 

 from it by its dark green, shining subcoriaceous leaves, and P. staminea by the tomentum and the 

 greater number of stamens. 



Mexico, State of Oaxaea (Cuatro Yenados, alt. 8500 ft.) : Eev. L. C. Smith, ISTo. 47, 1894. 



On pp. 1, 10 and 19, Da»iphora should be substituted for Comocarpa. I adopted Torrey & Gray's 

 subgeneric name for the genus whose type is Potentilla fruticosa L., not knowing that the genus had 

 been named Dasiphora by Rafinesque in his xlutikon. I am indebted to Professor Greene, of the 

 Catholic Tniversity, ^Washington, for information concerning this name, as no reference to Dasiphora 

 is found either in the Kew Index or in the Xomenclators of Steudel and Pfeifer. 



On p. 23, read P- longipeduneulata instead of P. longipes. 



On p. 40, add to the list of specimens under P. heterosepala Mexicana . C. G. Pringle, Xo. 5693, 

 1894 (unusually large specimens from the State of Oaxaea). 



On p. 62, add to the list of specimens under P. Ranunculus Lange : 



Labrador (Cape Chudley) : J. D. Sornborger, Xo. 24, 1896. 



This species is therefore to be added to those growing on the Xorth American continent. 



On Plate 28 read Potentilla ctenophora instead of var. ctenophora. 



On, Plate 101 read Dasiphora fruticosa instead of Comocarpa fruticosa. 



