262 PITTONIA. 
inches high, very slender: nutlet scarcely 4 line long, not at 
all granulate, but marked with close and low transverse 
rugosities which are straight, or some sinuate. 
Near Castroville, Monterey Co., California, May, 1888, J. B. 
Hickman. 
PLAGIOBOTHRYS ECHINATUS. Habit of P. tenellus and of 
the same size, rather more branehing, the branches strict, 
densely spicate at summit; the usual pubescence augmented 
by sparse spreading and rather hispid hairs: nutlets rather 
more than 4 line long, whitish, distinctly carinate on the back 
at least toward the apex, the transverse rugosities few, slender 
and indistinet, merely indicating the lines of numerous well 
elevated and sharp murications, the whole back thus appear- 
ing somewhat regularly echinate. 
Cedar Hill, Vancouver Island, 16 May, 1887, Mr. John 
Macoun. 
PLAGIOBOTHRYS COLORANS. Taller and stouter than P. 
tenellus, with shorter and more strict branches, the main stem 
simple and naked below; whole herbage hirsute, dark-colored 
when dry, deeply staining the papers dark-red or purple: 
nutlets vitreous-shining but colorless- rather than gray or 
whitish, the numerous low but sharp rugosities somewhat 
sinuate and entire, the intervening spaces presenting scat- 
tered but prominent murications. 
Collected at Hornbrook, near the summit of the Siskiyou 
Mountains in northern California, 15 May; 1889, by Mr. 
Thomas Howell. Quite like P. Torreyi, and unlike all other 
species, of its own group, in its dark-colored and staining 
herbage. | 
PLAGIOBOTHRYsS ASPER. Of the P.tenellus group, but larger 
than the others and rather diffusely branched or many- 
stemmed from the rosulate tuft of basal leaves, the branches 
hispid, floriferous almost throughout, many of the calyxes 
subtended by a leafy bract; leaves rather roughly hirsute or 
