106 NORTH AMERICAN FLORA (VorumE 21 
longer than the inner sepals; style-branches 3 or 2; seed globose-ovoid, 1.6-1.7 mm. long, 
lustrous, brownish-black. 
‘TYPE LOCALITY: Seashore, Celesttin, Yucatan. 
DistriBuTION: Known only from the type locality. 
7. Amaranthus ambigens Standley, sp. nov. 
Plants stout, erect, sparsely branched, glabrous, the stems striate, succulent, tinged with 
red; petioles slender, 1.8-2.7 cm. long, reddish; leaf-blades ovate or lance-ovate, 4.5-7 cm. 
long, 1-2.5 em. wide, cuneately acute and slightly decurrent at the base, tapering to the obtuse 
apex, mucronate, thin, plane, yellowish-green above, pale beneath and purplish-tinged, espe- 
cially along the veins; flowers dioecious or polygamo-dicecious, the staminate clusters few- 
flowered, arranged in dense, axillary and simple or terminal and paniculate spikes 1.5-5 
em. long and 4-6 mm. thick; sepals of the staminate flowers oblong or oval-oblong, 2 mm. 
long, acutish, short-mucronate, scarious, often tinged with red, the midnerve green; pistillate 
glomerules many-flowered, in dense, simple or paniculate spikes 2-15 cm. long and 6-9 mm. 
thick, these spreading or drooping, naked; sepals of the pistillate flowers oblong or lance-oblong, 
aristate-acute or acuminate, or the inner obovate-oblong and obtuse, tinged with red, the 
tips slightly spreading; bracts deltoid-lanceolate, acuminate, about half as long as the sepals; 
style-branches 3; utricle equaling or slightly exceeding the sepals, indehiscent; seed broadly 
oval, 1.1 mm. long, nearly black, lustrous. 
Type collected near Fountaindale, Illinois, by M. S. Bebb (U. S. Nat. Herb. no. 48297). 
DISTRIBUTION: In wet soil, northern Illinois to southeastern Minnesota. 
8. Amaranthus Watsoni Standley, Bull. Torrey Club 41: 505. 
1914. 
Amaranthus Torreyi suffruticosus Uline & Bray, Bot. Gaz. 19: 272. 1894. 
Stems stout or slender, 1.5-10 dm. high, erect or ascending, branched, obtusely angled, 
glandular-puberulent or short-villous, densely glandular above; petioles slender or stout, 
5-65 mm. long; leaf-blades rotund-ovate to rhombic-oval or oblong, 1-8 cm. long, obtuse to 
truncate at the apex and emarginate to deeply retuse, acutish or rounded at the base, some- 
times slightly decurrent, rather thick, deep- or yellowish-green, glandular-puberulent, at least 
beneath, often densely so on both surfaces; flowers dioecious, in axillary clusters, especially in 
the pistillate plants, and in terminal, often paniculate, erect or drooping, loose or dense spikes 
4-16 cm. long and 6-14 mm. thick; bracts lanceolate, slightly longer than the flowers, atten- 
uate to a subulate spinose tip, glandular-puberulent; sepals of the staminate flowers oblong, 
3-4 mmm. long, obtuse or acutish, !-nerved, the nerve excurrent; sepals of the pistillate flowers 
broadly spatulate, 2.5 mm. long, slightly united at the base, broadly rounded at the apex, 
usually emarginate, 1-nerved, the nerve sometimes excurrent in the outer sepals; stamens 5; 
style-branches 2; capsule globose, circumscissile; seed dark reddish-brown, rotund, 0.6 mm. in 
diameter. 
TYPE LOCALITY: Vicinity of Guaymas, Sonora. : 
DisTRIBUTION: Western Sonora and southern Lower California. 
9. Amaranthus Palmeri S. Wats. Proc. Am. Acad. 12: 274. 1877. 
Amaranthus Palmeri glomeratus Uline & Bray, Bot. Gaz. 19: 272, 1894. 
Stems stout, erect, 1-15 dm. high, much branched, the branches ascending or spreading, 
pale-green, sometimes tinged with red, glabrous, often villous about the inflorescence; petioles 
slender, 1.5-10 cm. long; leaf-blades broadly ovate to rhombic-ovate or lanceolate, 2-17 cm. 
long, acutish to abruptly acuminate or attenuate at the apex, the lowest rarely obtuse, rounded 
to acute at the base, bright-green, glabrous, or occasionally short-villous or puberulent beneath, 
prominently veined; flowers dioecious, in slender, terminal, erect or drooping, densely flowered 
spikes 8-30 em. long and 7-12 mm. thick; bracts usually 2-3 times as long as the flowers, linear 
to lanceolate or ovate, tapering to stout green rigid spinose tips; sepals of the staminate flowers 
