1905] NELSON—ROCKY MOUNTAIN PLANTS 57 
2. S. filiforme, n. sp.—A diminutive annual 3-5°™ high, with 
filiform stem drooping at summit, and the filiform leaves and capsules 
more or less secund; ciliate-pubescent throughout; the diminutive 
flowers yellow; tube of calyx wanting; capsules erect, straight, 
pubescent, filiform, 1-2°™ long. : 
Type in herb. Mo. Bot. Gard. from New River (Reese’s River), Utah, May 
28, 1889. Collector not known. 
3. S. NEtsontr Heller, Muhl. 1:1; S. minor A. Nels., Bull. Torr. 
Bot. Club 29:130.—Though Léveillé has seen fit to reduce this, 
a re-examination of the material at hand simply increases my belief 
in its validity. 
4. S. CHAMAENERIODES (Gray) Small, Bull. Torr. Bot. Club aa: 
189; Ocnothera chamaenerioides Gray, Pl. Wright 2:58.—This is a 
strongly marked species that seems never to be confused with any other. 
5. S. CAMPESTRE (Greene) Small, Bull. Torr. Bot. Club 23:189; 
Oenothera dentata Wats., Bot. Cal. 1:216.—Variable as to the 
curvature of the capsule, which is often greatly flexed. The large- 
flowered form is most frequently collected and may be known as 
follows. j 
5a. S. CAMPESTRE helianthemiflorum (Lévl.), n. comb.—This is 
the form of the species which is often distributed as Oenothera dentata 
grandiflora Wats. See plate in Lévl. Monog. opposite 178. 
5b. S. CAMPESTRE MINUS Small, Bull. Torr. Bot. Club 23:1809; 
Oenothera dentata cruciata Wats., Proc. Am. Acad. 8: 594:—Often 
distinguishable from the species with difficulty. Its stricter habit, 
smaller flowers, and more glabrate stems are characters usually 
mentioned. 
5c. S. CAMPESTRE mixtum (Lévl.), n. comb.—T wo specimens in 
herb. Mo. Bot. Gard. have been designated as forms mixta and 
permixta by Léveillé, Monog. 180. There seems to be no difference 
between them except the smaller flowers of the former. Since the 
former is a much older plant, it may happen that the later blossoms 
are small. Believing them to be the same, they are here given 
varietal rank. This variety may be known by the dark green, 
broadly linear leaves, which are dentate and very numerous, quite 
crowded and seemingly fascicled upon the short, spreading, or nearly 
prostrate branches. 
