108 NORTH AMERICAN FLORA [VoromE 21 
Stems stout, 1.5-5 dm. high, branched, the branches,ascending, glabrous, whitish, often 
tinged with red; leaves few, soon deciduous, pale-green, glabrous, the petioles slender, 5-20 mm. 
long, the blades lanceolate or narrowly oblong to linear-oblong, 1-3 cm. long, truncately 
rounded at the apex, acute or cuneate at the base; flowers monoecious, in dense many-flowered 
clusters arranged in sparsely leafy or naked terminal spike-like panicles; bracts half as long 
as the calyx or shorter, broadly ovate, acute; sepals of the pistillate flowers 5, spatulate, 2 mm. 
long, united at the base, rounded or emarginate at the apex, thin, conspicuously veined, often 
tinged with purple, the blades spreading in age; sepals of the staminate flowers oblong, obtuse; 
stamens 3; style-branches 3; utricle narrowly oblong, indehiscent; seed obovoid, 0.6-0.8 mm. 
long, dark reddish-brown. 
TyPE LOCALITY: Western Texas. 
DIsTRIBUTION: Western Texas and southern Arizona to Sonora and Sinaloa. 
13. Amaranthus scariosus Benth. Bot. Voy. Sulph. 158. 1844. 
Amaranthus floridus Benth. Bot. Voy. Sulph. 1. 51, hyponym. 1844. 
Sarratia scariosa Moa. in DC. Prodr. 13?: 269. 1849. 
Amblogyna scariosa Mog. in DC. Prodr. 132: 269, as synonym. 1849. 
Stems stout, erect, 1-1.5 meters high, stramineous, glabrous, or sparingly pubescent above; 
petioles slender, 2-10 cm. long; leaf-blades ovate or oblong-ovate, 6-12 cm. long, acute at the 
apex, the tip rounded, acute or abruptly acute at the base, yellowish-green, glabrous, con- 
spicuously veined, the veins white beneath; flowers monoecious, in very dense, slender, erect 
or drooping spikes, these 8-20 cm. long, aggregate in a dense terminal panicle 3-6 dm. long 
and 1.3-2.5 dm. wide; bracts subulate-lanceolate, pungent-tipped, slightly exceeding the flowers; 
sepals 5, those of the staminate flowers oblong, acute, those of the pistillate flowers spatulate, 
3 mm. long, rounded at the apex, often retuse, scarious, l-nerved, united at the base; stamens 5; 
style-branches 3; utricle much shorter than the sepals, circumscissile, thin-walled; seed orbicu- 
lar, black, 0.8 mm. in diameter. 
Type LocaLity: Tiger Island, Gulf of Fonseca, Honduras. 
DISTRIBUTION: Southwestern coast of Mexico to Costa Rica. 
ILLUSTRATION: Benth. Bot. Voy. Sulph. pl. 51 
14. Amaranthus chihuahuensis S. Wats. Proc. Am. Acad. 21: 436. 
1886. 
Stems stout, erect, 3-6 dm. high, the branches ascending, sparsely pubescent, pale-green; 
leaves numerous, yellowish-green, glabrous, or sparsely pubescent beneath, the petioles slender, 
5-20 mm. long, the blades ovate to ovate-oblong or elliptic, 2-5 cm. long, obtuse or rounded 
at the apex, acute at the base; flowers monoecious, in dense clusters, some of these axillary, 
others aggregated into a slender terminal leafy spike; bracts lance-subulate, shorter than the 
flowers; sepals 5, those of the staminate flowers oblong, acute, those of the pistillate flowers 
spatulate, 2 mm. long, scarious, united and thickened at the base, spreading in age, I-nerved, 
the nerve conspicuously excurrent; stamens 5; style-branches 3; utricle ovoid, shorter than the 
sepals, circumscissile; seed orbicular, dark reddish-brown, 0.8 mm. in diameter. 
Type Locanity: Hacienda San Miguel, Chihuahua. 
DIstRIBUTION: Chihuahua to Oaxaca. 
15. Amaranthus lepturus Blake, Jour. Bot. 53: 104. 1915. 
Plants erect, branched, about | meter high, the stems slender, whitish, glabrous; petioles 
1.4-2.8 cm. long; leaf-blades rhombic-oval, 2.1-2.7 cm. long, 1.3-1.6 cm. broad, obtuse or 
retuse and cuspidulate at the apex, broadly cuneate at the base, glabrous; flowers monoecious, 
spicate, the spikes erect, terminal and axillary, naked above, interrupted and leafy below, 
10—41 cm. long, 0.6-1.7 em. thick; bracts lance-subulate, spreading or recurved, 3.2 mm. long 
or shorter, longer than the sepals; staminate sepals ovate-lanceolate, acute, scarious, 2 mm. 
long; stamens 5; sepals of the pistillate flowers 5, oblong-spatulate, 2.5 mm. long, slightly 
spreading at the apex, retuse or obtuse or acutish, mucronulate, glabrous, or with a few short 
