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. Blake. 



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. Soc. 

 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. 



Sericocarpus rigidus Lindl. var. calif ornicus (E. Dur.) Blake, 

 n. comb. — Sericocarpus calif ornicus E. Durandl Journ. Acad. Nat. 

 Sci. Philad. (PI. 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 Museum 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. 



Gymnolomia 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 appressis rotimdatis) vel superiora integra supra viridia 

 subdense tuberculato-strigosa subtus distincte pallidiora subsparse 

 strigoso-hispida (pilis venas secundum longioribus) et sparse glandu- 

 loso-adspersa triplinervia 2.7-4.7 cm. longa 9-13 mm. lata, petiolis 

 vix marginatis paten ti-hispido-pilosis 3-5 mm. longis; ea inflore- 



