22 PITTONIA. 
less marked, while on more than half the length of each race- 
mose branch I find the four nutlets wholly distinet. The habit 
of the plant is perfectly that of the other prostrate species of 
Plagiobothrys. 
SONNEA. 
Inflorescence leafy, glomerate or rarely paniculate-racemose; 
pedicels filiform, not deciduous. Calyx 5-parted to the base, 
not accrescent, open in fruit. Nutlets ovate and rounded or 
ovate trigonous with lateral angles, carinate ventrally at apex, 
with or without a dorsal ridge, smooth or tuberculate-rough- 
ened ; the insertion medial or supramedial by a white, soft- 
cartilaginous or almost albuminoid, rounded or elongated ca- 
runcular scar to a pyramidal or depressed gynobase.—Low 
but robust scabrous and bristly annuals with ascending, leafy 
branches and no radical tuft of leaves: herbage not stain- 
ing.—Genus confined to the eastern slope of the Sierra Nevada 
and the adjacent parts of Nevada and Arizona, dedicated to 
Mr. Charles Frederick Sonne, of Truckee, California, who 
gives promise of becoming as intelligent a botanist as he has 
been a diligent collector and field-observer in that region of 
country to which these plants belong. 
* Nutlets rounded, the soft but stipe-like scar globose and 
supramedial.—(PrAcoroBorunys 8 Hypsouna, Gray). 
1. S. GLOMERATA.—Plagiobothrys glomeratus, Gray, Proc. 
Am. Acad. xx. 286. & Syn. Fl. Suppl. 432.— The nutlets in this 
species are fixed just beneath the apex and all four are elenriy 
separate from one another. 
2. S. ursPrDA.— Plagiobothrys hispida, Gray, l. e. In this 
the gynobase has but one complete line of separation and the 
nutlets are in two pairs, each pair being, moreover, coherent 
by a partial union of their almost gelatinous stipes, so that 
NOCUIT a al 
