]48  , DR. R. R. GATES : A STUDY OF NORTH AMERICAN 
Seeds numerous, linear, white-appendaged Seeds 6-12 in each cavity, linear-oblong, 
at each end. broadly winged at both ends, narrowly 
winged at the sides. 
Leaves lanceolate, the lowest spatulate, Leaves oblong-spatulate or oblanceolate, 
tapering into a petiole. evergreen. 
It is difficult to estimate the value of the differences between these two 
genera, or the number of steps which would be necessary to bridge the gap 
between them. But I believe we are more likely to be right in thinking of 
the differences as having come about through definite variations than in 
pieturing the gradual accumulation of infinitesimal differences. 
8. AMIANTHIUM, A. Gray. 
1, AMIANTHIUM MUSCJETOXICUM, A. Gray. 
A. muscetoxicum, A. Gray, in Ann. Lye. N.Y. iv. (1837) 122. 
Melanthium muscetoxicum, Walt. Fl. Car. (1788) 195. 
M. letum, Soland. in Ait. Hort. Kew. i. (1789) 488. 
M. myoctonum, J. F. Gmel. Syst. Veg. i. (1796) 587. 
Helonias leta, Ker, in Bot. Mag. (1805) t. 803; Lodd. Bot. Cab. (1894) t. 998. 
H. erythrosperma, Michx, Fl. Bor. Am. i. (1803) 212. 
Amiantanthus muscetoxicum, Kunth, Enum. Plant. iv. (1843) 180. 
Zigadenus muscetozicus, Regel, Gartenfl, xxxii. (1883) 164, t. 1121. f. 1. 
Chrosperma muscetoxicum, Kuntze, Rev. Gen. Pl. (1891) 708. 
Long Island and eastern Pennsylvania to Florida, Tennessee, Missouri, and 
Arkansas. 
2. AMIANTHIUM ANGUSTIFOLIUM, A. Gray. 
A. angustifolium, &. Gray, in Ann. Lyc. N.Y. iv. (1837) 194. 
Anthericum subtrigynum, Jacq. Ic. Rar. ii. (1793) t. 419. 
Helonias angustifolia, Michx. Fl. Bor. Am. i. (1803) 212, 
H. leta, B. minor, Ker-Gawl. in Bot. Mag. (1813) t. 1540. 
Zygadenus angustifolius, S. Wats. in Proc. Am. Acad. xiv. (1879) 980. 
Tracyanthus angustifolius, Small, Fl. SE. Un. St. (1903) 251. 
Melanthium phalangioides? Lam, Encyc. iv. (1823) t. 269. f, 4. 
North Carolina to Florida, in moist pine woods. 
3." AMIANTHIUM TEXANUM, comb. nov. 
Tracyanthus angustifolius, var. tevanus, Bush, Rep. Mo. Bot. Gard. xvii. ( 1906) 119. 
T. texanus, Small, Fl. S.E. Un. St. 2nd ed. (1913) p. 1829. 
In sandy swamps, eastern Texas. 
The genus Amianthium of Gray (Chrosperma, Rafin.) contains three 
species: A. muscetoxicum, extending from Long Island to Penn., Florida, and 
Arkansas ; A. angustifolium of narrower distribution, from N. Carolina to 
Florida ; and A. texanum in Texas. The latter two species have been placed 
in a separate genus, Tracyanthus, by Small, but it would be difficult to find 
