96 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Type in the U. 8. National Herbarium, no. 464048, collected at Tehuacadn, Puebla, 
Mexico, September, 1911, by C. A. Purpus (no. 5667). 
Closely related to Iresine schaffneri S. Wats., but distinguishable by the lustrous 
pubescence of the stems and by the fact that the leaves are early glabrate rather 
than permanently pubescent. 
Iresine pacifica Standley, sp. nov. 
Erect shrub, much branched, the branches ascending, slender, striate, green, 
glabrous except about the inflorescence, there very sparsely short-villous; petioles 
slender, 4 to 11 mm. long; leaf blades broadly ovate or rhombic-ovate to lance-oblong, 
or the uppermost lanceolate, 3.5 to 10.5 cm. long, 1.3 to 4 cm. wide, acute to long- 
acuminate, acute at the base, thin, glabrous, or very sparsely short-villous along 
the veins beneath; flowers polygamo-moncecious, in broad, open, much branched, 
sparsely leafy panicles, the branches elongate, very slender, ascending or spreading, 
the spikelets short, nearly all sessile, the rachis lanate; bracts and bractlets less than 
half as long as the flowers, suborbicular, rounded at the apex, short-villous, brown; 
sepals oval-oblong, 1.5 mm. long, rounded at the apex, 3-nerved, densely pilose with 
long soft brownish hairs; filaments shorter than the sepals, the staminodia less than 
half as long as the filaments, narrowly triangular, entire; style short, the stigmas 
slender; seed orbicular, slightly compressed, 0.6 mm. broad, black and shining. 
Type in the U. S. National Herbarium, no. 208570, collected near Manzanillo, 
Mexico, December, 1890, by Edward Palmer (no. 1074). 
ADDITIONAL SPECIMENS EXAMINED: 
Mexico: Manzanillo, 1890, Palmer 932. Cerro Colorado, Sinaloa, November 1, 
1904, Brandegee. 
This species is related to Iresine angustifolia Fuphrasén (I. elatior Rich.), but is 
readily distinguished by the rounded or obtuse bracts and bractlets and the broader 
leaves. 
Tresine rotundifolia Standley, sp. nov. 
Low shrub, fruticose nearly throughout, much branched, the branches stout, ascend- 
ing or divergent, dark gray or blackish, the branchlets stout, densely tomentose; 
leaves few, remote, undeveloped in the staminate plant at anthesis; petioles stout, 
1 to 4 mm. long; leaf blades orbicular to broadly ovate-oval, 3.5 to 17 mm. long, 3.5 to 
12 mm. wide, broadly rounded at the base, rounded or obtuse at the apex, sometimes 
emarginate, coriaceous, deep green and puberulent or glabrate on the upper surface, 
densely yellowish-tomentose beneath, the veins conspicuous beneath and usually 
evident on the upper surface; flowers dicecious; staminate spikelets 6 to 9 mm. long, 
densely flowered, in fascicles of 2 to 4 at the ends of short fruticose branches; bracts 
and bractlets ovate-orbicular, less than a third as long as the sepals, scarious, yellow- 
ish white, glabrous or nearly so, the sepals narrowly oblong, 3 mm. long, obtuse, 
sparsely short-villous at the apex; filaments slightly exserted, the tube very short, 
the staminodia minute; pistillate spikes (immature) short, densely flowered, in 
short, narrow terminal panicles, the bracts and bractlets broadly ovate, obtuse or 
acute, fuscous, glabrate. 
Type in the herbarium of the University of California (fragment in the U. 8. National 
Herbarium), no. 135872, collected in the vicinity of San Luis Tultitlanapa, Puebla, 
Mexico, May, 1908, by ©. A. Purpus (no. 3452). This specimen is taken from a stami- 
nate plant. The pistillate plant, with the inflorescence very immature, was collected 
at Esperanza in May, 1911, by C. A. Purpus (no. 5864), this also in the herbarium of 
the University of California. 
A very distinct species, because of the prevailingly suborbicular leaves and the 
peculiar form of the staminate inflorescence. 
