298 PROCEEDINGS OF THE AMERICAN ACADEMY 
species, to Mueller’s Gymmnostillingia, which may be considered a 
section or subgenus, characterized by solitary staminate flowers, the 
pistillate ones naked, and the seed without caruncle. 
STILLINGIA PAUCIDENTATA. Differing from the last in its stout 
angled stems branching above; leaves acuminate, an inch or two long, 
with 2 or 3 setaceous teeth on each side near the base ; spikes stouter 
and denser, the pistillate flowers more crowded ; capsule larger, with 
more prominent gynophore, and the larger seed oblong-ovate, slightly 
carunculate.— Colorado Valley, near mouth of Williams River; Dr. 
E. Palmer (n. 517, 1876). 
STILLINGIA ToRREYANA. A low glabrous annual (?), with angled 
leafy stems: leaves oblong-obovate, cuneate at base, rounded above, 
obscurely veined, acutely and sometimes doubly toothed, 6 to 10 lines 
long, with minute fimbriate caducous stipules : spikes terminal, sessile, 
short and slender: bracts very small, ovate, acute, 1-flowered, with 
nearly sessile disk-like glands: staminate calyx campanulate, diandrous, 
the pistillate of 3 triangular sepals: capsule over 2 lines broad, with 
stout gynophore: seeds oblong-ovoid, 1} lines long, smooth, with con- 
spicuous prominent caruncle.— Valley of the Rio Grande, at Eagle 
Pass; Dr. Bigelow, 1852. Sapium annuum, var. dentatum, Torr. in 
Bot. Mex. Bound. 201, and referred doubtfully by Mueller to Sebas- 
tiana Treculiana. ‘The latter, from the same region and much re- 
sembling the present species, is distinct though doubtless a congener. 
It is described as a perennial, 1 to 1} feet high, with a woody base. 
Its leaves are oblanceolate, acutish, 10 to 15 lines long; the capsule 
somewhat smaller, with a short stout-horned gynophore and large 
persistent central column; the seed smaller, subglobose, irregularly 
tuberculate, and with much smaller caruncle. 
CALLITRICHE sEpULTA. ‘Terrestrial, prostrate and rooting, with 
numerous narrowly linear leaves 2 or 3 lines long: bracts none: fruit 
broader than long, emarginate at each end, the thick carpels with 
acute divergent margins, on stout pedicels a line or two long, soon 
deflexed and buried in the soil: styles elongated, reflexed, soon 
deciduous. — Oregon; E. Hall (mn. 459). Allied to CO. deflexa, 
A. Braun (C. Austini, Engelm.), and to OC. Nuttallit, Torr., of which 
the latter has the same habit of burying its fruit. 
ErHepra Nevapensis. An erect shrub, 2 feet high or more, 
with opposite erect or somewhat diffusely spreading branches; bark 
splitting and becoming white and shreddy or fibrous: scales opposite, 
sheathing, with short acute lobes or somewhat elongated foliaceous 
tips, usually 1 to 3 lines long, at length mostly deciduous: staminate 
