RYDBERG: Rocky MOUNTAIN FLORA 63 
Epilobium latiusculum Rydb. sp. nov. 
Epilobium Drummond latiusculum Rydb. Mem. N. Y. Bot. Gard. 
e270. 1900. 
To the characters given in the original description may be 
added that the leaves are distinctly petioled, not sessile as in E. 
Drummondit. 
Epilobium platyphyllum Rydb. sp. nov. 
Epilobium glaberrimum latifolium Barbey, Bot. Calif.1: 220. 1876. 
Not E. latifolium L. 1753. 
Epilobium paniculatum, as usually understood, contains several 
forms or species, connecting on one hand with E. minutum, on the 
other with E. jucundum. In order to facilitate the further study 
of the groups, I give the following key of the Rocky Mountain 
forms. 
Tube of the hyper funnelform, 1-3 mm. (rarely 4 mm.) 
pias sunita only slightly exceeding the calyx, 2-3 mm. 
long; capsule glabrous; tube of hypanthium I-1.5 mm. 
long. 1. E. Tracyi. 
Petals pink or purple, 3.5-7 mm. long, about twice as long 
as the calyx 
Capsule and iiiceia glabrous or sparingly puberulent. 
Leaves and bracts very thick, horny at the apex, 
the latter very short; capsule glabrous; pedicels 
short. 2. E. subulatum.. 
Leaves and bracts not very thick, not. horny at 
the apex; capsule usually puberulent, at least 
when young; pedicels slender 3. E. paniculatum. 
Capsule and pedicels cial peaeeneieks ——€, 
very short. 4, E. adenocladum, 
Tube of the hypanthium 4-8 mm. long, cylindric or nearly so, 
abruptly widening into the calyx. 
Tube of the hypanthium about 4 mm. long; petals 6-7 
mm. long. 5. E. laevicaule. 
Tube of the hypanthium 7-8 mm. long; petals 10-12 mm. 
long 6. E. Hammondii. 
Epilobium Tracyi Rydb. sp. nov. 
Annual; stem 3-8 dm. high, perfectly glabrous, straw-colored; 
leaves 2-4 cm. long, linear, entire, glabrous; tube of the hypan- 
thium 1-1.5 mm. long, funnelform; calyx-lobes about 2 mm. long, 
very acute; petals white, 2-3 mm. long; capsule more or less 
