ParT 2, 1917] AMARANTHACEAE 157 
oblong, 12.5-21.5 cm. long, 3.3-6.5 cm. wide, cuneate at the base, acute or long-acuminate 
at the apex, usually somewhat abruptly so, thin, bright-green, glabrous above, loosely tomen- 
tose beneath along the veins when young, glabrate in age, the lateral veins conspicuous, arcuate- 
ascending; flowers polygamous, loosely paniculate, the panicle 9.5 cm. long and as broad, the 
branches ascending, thinly tomentose, the basal bracts linear, 2-2.5 cm. long; spikelets sessile, 
few-flowered, 2-2.5 mm. in diameter, the rachis lanate; bracts and bractlets ovate-orbicular, 
half as long as the sepals, obtuse or acutish, stramineous, hyaline, glabrous; sepals oval, 1.5—-2 
mm. long, obtuse, sparsely lanate at the base, stramineous; staminodia minute. 
TvPE LOCALITY: Near Gémez Farias, Tamaulipas, at an altitude of 350 meters. 
DIstRIBUTION: Known only from the type locality. 
4. Iresine nigra Uline & Bray, Bot. Gaz. 21: 350. 1896. 
Much branched shrub, the branches slender, spreading, terete, striate, glabrous, or sparsely 
puberulent in the inflorescence; petioles 3-15 mm. long; leaf-blades ovate, elliptic, or lance- 
elliptic, 4.5-14 em. long, 1.5-4 cm. wide, acute to long-acuminate at the apex, acute or acumi- 
nate at the base and short-decurrent, glabrous, or, when young, sparsely appressed-pilose, 
thick and firm, blackish when dry, the lateral veins divergent, not prominent; flowers poly- 
gamo-dioecious or sometimes perfect, loosely paniculate, the panicles pyramidal, often as 
broad as long, naked or sparsely leafy, the branches ascending or divergent; spikelets short, 
mostly sessile; bracts and bractlets half as long as the sepals or shorter, rounded-ovate, rounded 
at the apex, stramineous, glabrous; sepals ovate-oblong, 1.5 mm. long, obtuse, obscurely nerved, 
brownish, glabrous or sparsely pilose at the apex, the basal hairs soft, whitish, equaling or 
longer than the sepals; staminodia minute; style elongate, the stigmas slender; utricle obovoid; 
seed suborbicular, 0.8 mm. broad, shining. 
Type Locality: San Pedro Sula, Honduras. 
DISTRIBUTION: Vera Cruz to Honduras and Salvador. 
5. Iresine pacifica Standley, Contr. U. 5. Nat. Herb. 18: 96. 1916. 
Erect shrub, much branched, the branches ascending, slender, striate, green, glabrous 
except about the inflorescence, there very sparsely short-villous; petioles slender, 4-11 mm. 
long; leaf-blades broadly ovate or rhombic-ovate to lance-oblong, or the uppermost lanceolate, 
3,.5-10.5 em. long, 1.3-4 em. wide, acute to long-acuminate at the apex, acute at the base, thin, 
glabrous, or very sparsely short-villous along the veins beneath; flowers polygamo-monoecious, 
in broad, open, much branched, sparsely leafy panicles, the branches elongate, very slender, 
ascending or spreading, the spikelets short, nearly all sessile, their rachises 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 orbict- 
lar, slightly compressed, 0.6 mm. broad, black and shining. 
Tyre Locality: Near Manzanillo, Colima. 
DISTRIBUTION: Sinaloa to Colima. 
6. Iresine angustifolia Euphrasén, Beskr. St. Barthel. 165. 1795. 
Tresine elatior Rich.; Willd. Sp. Pl. 4: 766. 1805. 
Tresine racemosa Poir. in Lam. Encyc. Suppl. 3: 180. 1813. 
Rosea elatior Mart. Nov. Gen. & Sp. 2: 59. 1826. 
Xerandra elatior Raf. Fl. Tell. 3: 43. 1837. 
Tresine virgata Poepp.; Mog. in DC. Prodr. 13?: 343, as synonym. 1849. 
Tresine acutifolia Sw.; Mog. in DC. Prodr. 13?: 343, assynonym. 1849. 
Rosea virgata Klotzsch; Seub. in Mart. Fl. Bras. 51: 226, as synonym. 1875. 
‘Alternanthera linearis Bello, Anal. Soc. Esp. Hist. Nat. 12: 107. 1883. 
Erect perennial, 5-10 dm. high, stiffrutescent at the base, much branched, the branches 
slender, ascending, striate, green, very sparsely short-villous on the young branches and in 
the inflorescence, soon glabrate; petioles very slender, 0.5-2.5 cm. long; leaf-blades lance-ovate 
to linear-lanceolate, 5-10.5 cm. long, 0.8-4 cm. wide, acuminate to long-attenuate at the apex, 
acute to long-acuminate at the base, thin, deep-green, glabrous, or very sparsely short-villous 
