CONTRIBUTIONS FROM THE GRAY HERBARIUM OF HARVARD 
UNIVERSITY.— NEW SERIES, NO. XLV. 
Presented by B. L. Robinson, June 17, 1915. Received June 17, 1915. 
I. COMPOSITAE NEW AND TRANSFERRED, CHIEFLY 
MEXICAN 
By S. F. Buake. 
SERICOCARPUS BIFOLIATUS (Walt.) Porter var. Collinsii (Nutt.) 
Blake, n. comb.— Aster Collinsii Nutt.! Journ. Acad. Nat. Sci. Philad. 
vii. 82 (1834). Sericocarpus Collinsii Nutt. Trans. Am. Philos. Soe. 
ser. 2. vii. 302 (1841). Sericocarpus tortifolius (Michx.) Nees var. 
Collinsii (Nutt.) Torr. & Gray, Fl. N. Am. ii. 103 (1841). — Nuttall’s 
type in the British Museum, collected by Ware in eastern Florida, 
has obovate leaves, 3—-5-toothed above the middle, but is indistinguish- 
able in any other character from the ordinary form of the species. So 
noteworthy a variation, although not recognized by Dr. Gray in the 
Synoptical Flora, seems to merit varietal rank. 
ERICOCARPUS RIGIDUS Lindl. var. californicus (E. Dur.) Blake, 
n. comb.— Sericocarpus californicus E. Durand! Journ. Acad. Nat 
Sci. Philad. (Pl. Pratt.) ser. 2. iii. 90 (1855).— All the Californian 
specimens of Sericocarpus rigidus examined, including the type of S. 
californicus in the herbarium of the Muséum d’Histoire Naturelle at 
Paris, collected near Nevada City by Rattan, differ from the nearly 
glabrous northern forms of the species in their more or less densely 
short-hispid-pilose stems, and appear to constitute a well defined 
geographical variety. 
Gymnotomia obscura Blake, n. sp. Annua tenuis erecta sursum 
parce ramosa 1.9-3.5 dm. alta. Caulis leviter striatus hispidulus et 
strigosus pallide brunneus. Folia inferiora (3-7-juga) opposita 
superiora alterna oblongo-ovata vel oblongo-lanceolata vel lanceolata 
acuta vel subacuminata basi cuneata crenato-dentata (dentibus ca. 
7-9-jugis a appressis rotundatis) vel superiora integra supra viridia 
subdense “tuberculato-strigosa subtus distincte pallidiora subsparse 
Strigoso-hispida (pilis venas secundum longioribus) et sparse glandu- 
0so-adspersa triplinervia 2.7-4.7 cm. longa 9-13 mm. lata, petiolis 
vix marginatis patenti-hispido-pilosis 3-5 mm. longis; ea inflore- 
