546 MACBRIDE. 



Greeneocharis dichotoma (Greene), comb. nov. — Krynitzkia 

 dichotoma Greene, Bull. Calif. Acad. i. 206 (1885). The original collec- 

 tion from western Nevada is the only representation of this species at 

 the Gray Herbarium; other specimens so referred belong rather to 

 the widely distributed and somewhat variable G. circumscissa (H. & A.) 

 Rydb. The latter is canescent with a more or less appressed-strigose 

 pubescence, especially on the stems and branches. A plant with fine 

 widely spreading hairs and scarcely, if at all, strigose-canescent has 

 been collected at an elevation of 3050 m., while the typical form seldom 

 attains half this altitude. This high-mountain variation may be 

 known as 



Greeneocharis circumcissa (H. & A.) Rydb., var. hispida, var. 

 nov., hispida vix strigoso-canescens; pilis patentibus. — Specimen 

 examined: California: trail to Mt. Whitney, August 13, 1904, 

 Cvlhcrtson, no. 4243 (type, in Gra.y Herb.). 



Plagiobothrys catalinensis (Gray), comb. nov. — F. arizmiicus 

 (Gray) Greene, var. catalinensis Gray, Syn. Fl. ii. pt. 1, 431 (1886). Be- 

 sides differing from P. arizonicus in the open fruiting-calyx with ovate 

 lobes and the duller rougher nutlets (as pointed out by Dr. Gray, 

 1. c), P. catalinensis has other distinguishing features. Mature nutlets 

 are only 1.5 mm. long, dark in color, the rugae obscure and not at all 

 acute, the ventral keel low and narrow, and the caruncle small. 

 Mature nutlets of the former plant are nearly or quite 2.5 mm. long, 

 light (almost white) in color, the rugae very distinct and acute, and 

 the ventral keel and caruncle usually prominent. Moreover the 

 spikes of the mainland plant are usually interruptedly bracteate or 

 even naked above; the spikes of the insular species are uniformly 

 bracteate throughout. 



Oreocarya virgata (Porter) Greene, forma spicata (Rydb.), 

 comb, nov.— 0. spicata Rydb. Bull. Torr. Bot. Club, xxxvi. 678 (1909). 

 Although the surface-character of the nutlets is generally diagnostic 

 in this genus, the smooth-fruited plant represented by the above 

 name is surely not worthy even varietal rank, let alone specific. 

 The nutlets of 0. virgata vary greatly in the degree of roughness; 

 and plants with more or less roughened fruits and those with per- 

 fectly smooth fruits that grow together in the region of Pike's Peak 

 are otherwise indistinguishable. 



Oreocarya multicaulis (Torr.) Greene, var. cinerea (Greene), 

 comb. nov. — 0. cinerea Greene, Pitt. iii. 113 (1896). The only 

 character that distinguishes this is the pubescence. As in the typical 

 form the color of the nutlets and the height of the stems amount to 



