56 BOTANICAL GAZETTE lyuny 
Ovate to orbicular........ Gey 23.- SS pirale. 
13a. S. spirale viridescens. 
13b. S. spirale clypeatum. 
Flowers white or rose color. 
Leaves glabrous or nearly so. 
Bark of stem shining and shreddy..... 14. 5S. decorticans. 
Bark of stem green. 
Capsules evenly distributed.........15. S. tortum. 
15a. S. tortum Eastwoodae. 
Capsules interruptedly crowded...... 16. S. tortuosum. 
Leaves not glabrous. 
Viious or tomentose 3.4... 02:23. 2... 17. S. utahense. 
More or less pubescent but not tomentose. 
Capsules enlarged at base. 
Bark glabrous and shreddy.-..... 18. S. Boothii. 
‘Bark hirsute, not shreddy.........19. S. Lemmoni. 
Capsule not noticeably enlarged at base. 
Branches paniculately branched 
ata ee Oe ace Sane EP et eae er 20. S. Hitchcockii. 
Branches simple above........... 21. S. alyssoides. 
_ ata. S. alyssoides macrophyllum. 
1. S. ANDINUM (Nutt.) Walp. Repert. 2:79; Oenothera andit 
Nutt., T. & G. Fl. N. A. 1:512.—Not often collected but no dou 
of frequent occurrence from western Wyoming westward and no 
ward to Nevada and Washington, where it passes into 
1a. S. ANDINUM Hilgardi (Greene), n. comb.; Oenothera Hilgar 
Greene, Bull. Torr. Bot. Club 10:42.—There is no possibility of 
maintaining this as a distinct species. No differences except a sligh 
greener hue and somewhat greater size in all of its parts is percep ‘ib 
These differences may well be due to the moré vigorous gro 
induced by the greater moisture and higher temperature in the 
of the variety. ) 
tb. S. ANDINUM minutum, n. var—A very diminutive 
related to S. andinum, with minute flowers, obovate petals, 
unequal stamens (the one set almost rudimentary), calyx tube 
wanting, and the capsule somewhat clavate, tapering to a 
cel. 
Specimens are pencil drawings, showing the above characters, made by 
Gro. ENGELMANN, and bearing the herbarium name Oenothera minuta. 
sibly future collections may show this worthy of specific rank. 
