EPILOBIACEAE. 
247 
io. MERIOLIX Raf. 
Throat of the hypanthium dark-purple within. i. M. melanoglottis. 
Throat of the hypanthium orange within, sometimes with a darker ring at the 
base of the stamens. 2. M. serrulata. 
1. Meriolix melanoglottis Rydb. On plains from Tex. to Colo.—“ Colo.,” 
exact locality not given. 
2. ^Meriolix serrulata (Nutt.) Walp. (Oenothera serrulata Nutt.) On 
plains and hills from Man. and Sask. to Colo, and Ariz.—Alt. 4000-8000 ft.— 
Boulder; Denver; first range of foot-hills, Larimer Co.; Ft. Collins; Palmer 
Lake; Ouray; Monument; Manitou Junction; Pennock’s mountain ranch. 
11. Taraxia Nutt. 
Leaves linear, silky-hirsute. 1. T. gracilidora. 
Leaves oblanceolate, glabrous. 2. T. subacaulis. 
1. Taraxia graciliflora (H. & A.) Raim. Hillsides in California. One 
specimen collected by Fremont is labeled “ Arkansas River, above Pueblo.” 
This may have been a mistake in labeling, as the species is not known east 
of the Great Basin. 
2. Taraxia subacaulis (Pursh) Rydb. (Jussiaea subacaulis Pursh; Oeno¬ 
thera heterantha Nutt.) In valleys from Mont, and Ida. to Colo, and Calif. 
—Steamboat Springs. 
12. SPHAEROSTIGMA Nutt. 
Corolla yellow, turning reddish or greenish; plant hirsutulous below; often 
glandular above. 1. S. pubens. 
Corolla white or rose-color; plant stigulose or puberulent. 2. S. minutihorum. 
1. Sphaerostigma pubens (S. Wats.) Rydb. ( Oenothera strigulosa pubens 
S. Wats.) In sandy soil from Ida. and B. C. to Colo, and Calif.—Arkansas 
River above Pueblo. 
2. Sphaerostigma minutiflora (S. Wats.) Rydb. ( Oenothera allysoides 
minutiflora S. Wats.) In sandy soil from Wyo. to Colo, and Nev.—Grand 
Junction. 
13. CHYLISMA Nutt. 
1. Chylisma scapoidea (Nutt.) Small. ( Oenothera scapoidea Nutt.) In 
arid soil from Wyo. to Colo, and Utah.—Alt. 4500-7000 ft.—Palisade, bank of 
Grand River; Cimarron; Grand Junction; Hotchkiss; Canon City. 
14. STENOSIPHON Spach. 
1. Stenosiphon linifolium (Nutt.) Britton. (S. virgatus Spach.) On prai¬ 
ries from Neb. and Colo, to Ark., Tex. and Mex.—Exact locality not given. 
15. GAURA L. 
Anthers oval, attached near the middle; fruit fusiform, sessile, almost equally 
8-ribbed. 1. G. parviflora. 
Anthers linear or nearly so, attached near the base; fruit strongly 4-angled, 
at least above. 
Fruit sessile, broadly fusiform; tall biennials. 2. G. neo-mexicana. 
Fruit prolonged below into a stipe-like base. 
