162 NORTH AMERICAN FLORA [Volume 21 
19. Iresine nitens Standley, Contr. U. S. Nat. Herb. 18: 95. 1916. 
Erect shrub, sparsely branched, the branches erect, striate, densely and closely pilose- 
sericeous with lustrous silvery-white hairs, glabrate in age; petioles 5-7 mm. long; leaf-blades 
lanceolate, 2-6 cm. long, 0.51.3 em. wide, long-acuminate or acute at the apex, acute at the 
base, thick and firm, when young strigose-pilose with lustrous white hairs, soon glabrate, the 
lateral veins conspicuous, ascending; flowers dioecious, paniculate, the panicle on a long naked 
peduncle, very narrow, elongate, the simple primary branches very short, the spikelets elongate, 
mostly sessile, the rachis densely lanate; bracts and bractiets of the pistillate flowers equaling 
the sepals, ovate or ovate-oblong, acute or acuminate, hyaline, stramineous or fuscous, glabrous, 
the sepals narrowly lanceolate, 2 mm. long, long-attenuate, 3-nerved, densely lanate, the long 
soft hairs brownish; style nearly as long as the ovary, the stigmas short, slender; utricle oblong, 
acute; seed 1 mm. long, yellowish-brown, shining. 
Tyre Locatiry: Tehuacdn, Puebla. 
DistRIBUTION: Known only from the type locality. 
20. Iresine Schaffneri S. Wats. Proc. Am. Acad. 21: 437. 1886. 
Erect shrub, 4-10 dm. high, much branched, the branches suberect, slender, terete, striate, 
densely pilose-strigose, sometimes glabrate in age; petioles stout, 3-20 mm. long; leaf-blades 
ovate, lanceolate, or lance-oblong, 2-9 cm. long, 0.5-3 em. wide, acttte or acuminate at the 
apex, rarely obtuse, acute or obtuse at the base, firm, densely appressed-pilose on the lower 
surface, canescent above when young but soon glabrate and bright-green; flowers dioecious, 
in narrow elongate naked panicles, or the panicles rarely broad, their branches ascending or 
suberect, the inflorescence always on a long naked peduncle, this often longer than the panicle; 
spikelets sessile, usually congested, the rachis densely lanate; bracts and bractlets of the 
staminate flowers one third as long as the sepals, obtuse or rounded at the apex, glabrous, 
scarious, dull-whitish, the sepals ovate-oblong, obtuse, pilose; filaments filiform, equaling the 
sepals, the staminodia short, finely dissected at the apex; bracts and bractlets of the pistillate 
flowers nearly as long as the sepals, ovate-orbicular, often dentictlate, the sepals oblong- 
ovate, 1.5 mm. long, acuminate, 3-nerved, densely villous with long soft white hairs; stigmas 
elongate, filiform; utricle ovoid. 
TYPE LocaLiry: San Luis Potosi. 
DistrrBution: Dry, rocky hillsides, southern Chihuabua, San Luis Potosi, Hidalgo, and 
Querétaro. 
21. Iresine cassiniaeformis Schauer, Linnaea 19: 708. 1847. 
Erect shrub, 1-1.5 meters high, much branched, the branches slender or stout, terete, 
smooth, densely and closely tomentose when young, glabrate in age, the bark of older branches 
brown; petioles stout, 3-23 mm. long; leaf-blades broadly ovate to ovate-oblong or elliptic- 
oblong, 1.5—10.5 cm. long, 1.5—6 cm. wide, acute to obtuse or rounded at the apex, acute to 
rounded at the base, subcoriaceous, subrugose, puberulent or scaberulous on the upper 
surface, glabrate in age, densely whitish-tomentose beneath, the veins very prominent, coarse, 
ascending; flowers dioecious, paniculate, the panicles terminal, broad or somewhat congested, 
2.5-4 dm. long, leafy below; spikelets sessile, short and dense, the rachis tomentose; bracts 
and bractlets of the staminate flowers one third as long as the sepals, suborbicular, stramineous, 
glabrous, the sepals elliptic-oblong, 2 mm. long, obtuse, whitish, glabrous, or the inner ones 
sparsely villous; filaments shorter than the sepals, subulate, the staminodia narrowly triangular, 
entire, less than half as long as the filaments; bracts and bractlets of the pistillate flowers 
shorter than the sepals, suborbicular, stramineous or brownish, glabrous, the sepals oval- 
oblong, obtuse, 1.5 mm. long, faintly nerved, white-pilose with long soft hairs; style very 
short, the stigmas short and stout; utricle subglobose; seed 1 mm. long, yellowish-brown. 
TYPE LOCALITY: Mexico. . 
DistTRIBUTION: San Luis Potost and Tamaulipas. 
22. Iresine discolor Greenman, Proc. Am. Acad. 33: 477. 1898. 
Erect shrub, much branched, the branches slender, ascending, densely and finely tomen- 
tose when young, glabrate in age, the older branches with grayish bark; petioles slender, 3-8 
