120 NORTH AMERICAN FLORA [VoLumME 21 
Utricle fleshy, 3-5-angled. 
Seeds strongly flattened. 
Bracts much shorter than the utricle; utricle 2.5~3.5 mm. long; seed 
2 mm. in diameter; inflorescence leafy. 1. A. cannabina. 
Bracts equaling or longer than the utricle; utricle 1.5~2.5 mm. long; 
seed 1 mm. in diameter; inflorescence naked or nearly so. 2. A. cuspidata. 
‘Seeds lenticular, turgid. 
Utricle 1.2 mm. long or less, thin; clusters of the pistillate inflorescence 
few-flowered; leaf-blades linear to narrowly oblong. 3. A. floridana. 
Utricle 1,5-2 mm. long, thick; clusters of the pistillate inflorescence many- 
flowered; leaf-blades elliptic to ovate. 
Sepals mucronate; pistillate spikes composed of few, usually distant, 
spherical heads ‘g-1 8 mm. in diameter. 4, A. concatenaia. 
Sepals not mucronate; pistillate spikes of numerous crowded clusters 
4-10 mm. in diameter. 5. A. alabamensis. 
Utricle membranaceous, not angled. 
Utricle irregularly dehiscent or indehiscent. 
Stems stout, erect; leaf blades mostly ovate or lanceolate and acute or 
acuminate, broadest near the base. 6. A. altissima. 
Stems slender, decumbent or prostrate; leaf blades mostly obovate to 
spatulate, rounded or obtuse at the apex, broadest above the middle. 7. 
Utricle circumscissile. 8 
. subnuda. 
. tamariscina. 
naib 
1. Acnida cannabina L. Sp. Pl. 1027. 1753. 
Acnida rusocarpa Michx. Fi, Bor. Am, 2: 234. 1803. 
Acnida ruscocarpa Willd. Sp. Pl. 4: 768. 1805. 
Amaranthus macrocaulos Poir. in Lam. Encye. Suppl. 1: 314. 1810. 
Acnida salicifolia Raf. Am. Mo. Mag. 2: 43. 1817. 
Acnida obtusifolia Raf. New Fl. 1: 54. 1836. 
Acnida obtusifolia retusa Raf. New FI. 1: 54. 1836. 
Acnide obtustfolia pumila Raf. New Fl. 1: 54. 1836. 
Acnida obtustfolia procera Raf. New Fl. 1: 54. 1836. 
Acnida Ellioti Raf. New Fl. 1: 54. 1836. 
Acnida cannabina lanceolata Mog. in DC. Prodr. 132: 277. 1849. 
Acnida cannabina salicifolia Mogq. in DC. Prodr. 137: 278. 1849. 
Plants glabrous throughout, succulent; stems stout, 3~30 dm. high, often enlarged at 
the base, smooth or sulcate, green, branched above, the branches strongly ascending; leaves 
numerous, the petioles slender, 1.5-5.5 cm. long, the blades 5-15 cm. long, 1-3 cm. wide, 
narrowly lanceolate to ovate, the uppermost often linear, long-attenuate or acuminate at the 
apex, the tip rounded or obtuse, acute to attenuate at the base, yellowish-green, the blades of 
the staminate plants often nearly all linear or oblong-linear; staminate flowers in an elongate 
leafy panicle composed of slender, naked, densely flowered spikes 4-15 em. long and 5-7 mm. 
thick; pistillate flowers in narrow elongate leafy panicles composed of numerous slender, 
loosely flowered, axillary spikes 5-20 cm. long and 5-10 mm. thick; sepals 3 mm. long, oval or 
oblong, rounded to acutish at the apex, at least the outer ones mucronate, scarious, l-nerved, 
twice as long as the bracts; bracts of the pistillate flowers lanceolate to ovate or oblong, half 
as long as the utricle, acute, often mucronate, thin, not pungent; stigmas 3-5, elongate; 
utricle 2.5-3.5 mm. long, obovoid, 3-5-angled, fleshy, green, becoming black, indehiscent, 
smooth or roughened; seed obovate, strongly flattened, 2 mm. long, minutely granulate or 
nearly smooth, reddish-brown. 
TYPE LOCALITY: Virginia. 
DISTRIBUTION: Tidal marshes, New Hampshire to northern Florida. 
ILLustRaTIons: Michx. Fl. Bor. Am. pl. 50; Barton, Elem. Bot. pl. 29, f. 1, 2; Gaertn. Fruct. 
pl. 126; Britt. & Brown, Ill. Fl. f. 1409; ed. 2. f. 1670. 
2. Acnida cuspidata Bert.; Spreng. Syst. Veg. 3: 903. 1826. 
Acnida cannabina cuspidata Moq,. in DC. Prodr. 132: 277. 1849. 
Acnida australis A. Gray, Am. Nat. 10: 489. 1876. 
Acnida cannabina australis Uline & Bray, Bot. Gaz. 20: 157. 1895. 
Plants glabrous throughout; stems stout, erect, 1-7 m. high, usually much thickened 
at the base, smooth, sticculent, much branched above; leaves numerous, the petioles slender, 
2-20 em. long, the blades narrowly lanceolate to ovate, 6-30 cm. long, 1.5-14 cm. wide, 
acuminate or long-attenuate at the apex, rounded to actite at the base, undulate, yellowish- or 
bright-green, prominently nerved; staminate flowers in narrow, leafy or naked panicles com- 
