1909] NELSON— PLANT AE M ISC ELLA NEAE 437 



PLANTAE MISCELLANEAE 



Euphorbia manca, n. sp. — Annual, the decumbent base giving rise 



to few to several simple, erect branches 1-2 dm high: leaves obovate- 

 cuneate, broadly obtuse, numerous, the lower reduced: primary 

 floral bracts ovate-reniform; the secondary broadly reniform, some- 

 times connate: inflorescence once or twice trichotomous : capsule 

 about 4 mm long: seeds short cylindrical-oblong, gray but not ashy, 

 nearly smooth. 



Mancos, Colorado, June 23, 1898, Baker, Earle, and Tracy 23. 



This has been referred to E. crenulata Engelm. by Norton in Rep. Mo. 

 Bot. Gard. 10:36. 1899. That species, as there constituted, however, is clearly 

 an aggregate, both annuals and perennials being included even when of very 

 diverse habits. The segregates readily discriminated seem to be as follows: 



Perennial with branched stems from horizontal or ascend- 

 ing rootstocks; leaves crenulate; seeds with deep dark- 



colored pits. 



1. E. Norton iana 



Annuals: 



Stems branched above; leaves crenulate; seeds ash- 



ermi 



2. E. crenulata 



shallow pits. 



Stem branched from the decumbent base; leaves entire; 



seeds greenish gray, nearly smooth. 3. E. manca 



E. crenulata is characterized adequately in the original description in Bot. 

 Mex. Bound. 192; as well as in Wats. Fl. Cal. 2: 75 (as E, leptocera, an undoubted 

 synonym); and in Greene, Man. Bay Region 80. 



Euphorbia Nortoniana, n. sp. — E. crenulata of Norton in Rept. 

 Mo. Bot. Gard. 10:36. 1899, as to the perennial plant, from which 

 the description is chiefly drawn. 



Apparently common in California, the type selected being Heller 6625 (San 

 Francisco, April 25, 1903) and 6486 (Pacific Grove, March 30, 1903). 



In his key to the species of Euphorbia, Norton provides for both the annual 

 and the perennial "plants (/. c. 8) ; and a very different plant from the above served 

 for the figure on his pi. 36. 



Gaurella canescens (Torr. and Frem.), n. comb.— Oenothera 

 canescens Torr. and Frem., Fremont's Rep. 315. 1845; Gaurella 

 guttulata (Geyer) Small, Bull. Torr. Bot. Club 23:183. 1896. 



1 



University of Wyoming 

 Laramie, Wyoming 



