372 ° CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
This Mexican plant differs from the Texan species, A. obtusa, in its smaller 
and thicker leaves, more branched and stouter stem, stouter petioles, and 
sessile flowers. Type in the herbarium of the Missouri Botanical Garden, 
eollected at Monterey, Mexico, June 22, 1848, Gregg 157. 
ACLEISANTHES NUMMULARIA Jones, Contr. Western Bot. 10:43. 1902. This, 
the only other species of the genus, was named from specimens collected near 
E1 Paso, Texas, but I have not been able to see specimens of the species. 
11. HERMIDIUM &. Wats. ‘ 
Hermidium S. Wats. Bot. King Explor. 286, 1871. 
Perennial herbs, glabrous, erect; leaves opposite, entire, short-petioled, 
thick and fleshy; flowers at the ends of the branches or axillary, on short 
peduncles, 3 flowers on each peduncle, each flower pediceled and subtended 
by a large, ovate, leaf-like bract; calyx campanulate, purplish, slightly lobed ; 
stamens’5 to 7, about as long as the perianth; fruit subspherical, smooth, 
glabrous, 
A monotypic genus. The plant very closely resembles Quamoclidion multi- 
florum except in its involucral bracts, which are not united to form a calyx- 
like involucre, and in the shape of the perianth. 
1. Hermidium alipes S. Wats. Bot. King Explor. 286. 1871. 
Specimens examined: 
NevaDA: Humboldt Valley, 1860, S. Watson 960, type collection; Palmetto 
Range, 1898, Purpus 5862: Wadsworth, 1902, J. C. Jacobs 458; Can- 
delaria, Shockley 31. 
CALIFORNIA: Panamint Canyon, 1897 Jones; Sierra Mountains, 1875, 
Lemmon; near Laws, 1906, Heller 82380. 
UtTaH: Willow Springs, 1891, Jones. 
12. SENKENBERGIA Schauer. 
Senkenbergia Schauer, Linnea 19: 711. 1847. 
Lindenia Mart & Gal. Bull. Acad. Brux. 10°: 357, 1843, not Benth. 1842. 
Tinantia Mart & Gal. loc. cit. 11': 240, 1844, not Schiedw. 1839. 
Boerhaavia of various authors in part, not L. 
Perennial, erect herbs, glabrous or puberulent; leaves opposite, thick and 
fleshy, entire, petioled; flowers in bracted racemes; calyx red, funneiform, 
with a short, narrow tube, which expands gradually into the broad limb; fruit 
asymmetrical, gibbous, glaucous, 10-ribbed, 
KEY TO THE SPECIES, 
Steam and leaves glabrous; racemes solitary, not subtended 
by bract-like leaves. ~~~. ~ ~-----~~-___- woe 1. S. gypsophiloides, 
Stem and leaves more or less puberulent; racemes of flow- 
ers panicled, the separate racemes subtended by bract- 
like leaves___ ~~~ eee 2. S. crassifolia, 
1. Senkenbergia gypsophiloides (Mart. & Gal.) Benth. & Hook. Gen. PI, 3:6. 
1880. 
Lindenia gysophiloides Mart. & Gal. Bull. Acad. Brux. 10°: 357. 1843. 
Tinantia gypsophiloides Mart. & Gal. loc. cit. 11°: 240. 1844, 
Senkenbergia annulata Schauer, Linnea 19: 711. 1847. 
Boerhaavia gibbosa Pavon; Choisy in DC. Prod. 18°: 457. 1849. 
Boerhaavia gypsophiloides Coulter, Contr. Nat. Herb. 2: 354. 1894. 
