BORAGINACEAE. 
287 
Corolla 7-8 mm. broad ; nutlets muricate and cross-ridged, but not honey¬ 
comb-crested. 5. O. data. 
Corolla 4-5 mm. broad; nutlets honey-comb-crested. 
6. O. Bakeri. 
Sepals lanceolate to linear, much exceeding the nutlets; inflorescence 
thyrsoid. 
Inflorescence a broad open round-topped thyrsus; branches usually 
again branched. 
Tall, 2-4 dm. high; nutlets with acute backs and sharply acute or 
slightly winged margins; tubercles united into more or less dis¬ 
tinct cross-ridges. 
Plant light yellowish-green ; nutlets more or less distinctly winged ; 
cross-ridges of the nutlets rather regular and uniting on the back. 
7. O. hispidissima. 
Plants dark green; nutlets merely acute-angled and irregularly 
cross-ridged. 8. O. thyrsidora. 
Low, 1-2 dm. high ; nutlets with rounded backs and merely acutish- 
margined; muriculations united into almost star-shaped tubercles. 
9. O. aperta. 
Inflorescence, at least in flower, a narrow, almost spike-like thyrsus; 
if more open, branches simple. 
Plant green, very hispid; only the basal leaves canescent; bristles with 
very conspicuous pustulate bases, much longer than the short 
strigose or tomentose pubescence. 
Corolla 7-10 mm. wide ; nutlets ovate, more than half as wide as long ; 
basal leaves broadly spatulate densely canescent. 
10. O. glomerata. 
Corolla 5-7 mm. wide ; nutlets lanceolate, less than half as wide as 
long; basal leaves broadly oblanceolate, somewhat canescent; 
plant 1.5-2 dm. high. 11. O. perennis. 
Plant canescent; basal leaves at least with inconspicuous bristles, 
which are scarcely longer than the other pubescence; pustulate 
bases inconspicuous. 
Plant stout, 3-4 dm. high, rather simple; corolla 7-10 mm. wide. 
12. O. argentea. 
Plant low, less than 1 dm. high, densely cespitose. 
13. O. nana. 
Corolla-tube long-exserted. 
Corolla white. 
Nutlets more or less distinctly rugose with irregular cross-ridges as well 
as muricate. 
Ridges of the nutlets honey-comb-crested; inflorescence a narrow thyrsus; 
leaves canescent and hispid. 14. O. eulophus. 
Ridges of the nutlets neither much interlacing nor crested. 
Inflorescence at least in fruit open with elongated branches; stem stout. 
15. O. longiflora. 
Inflorescence narrow; stem slender. 16. O. cristata. 
Nutlets finely muricate; inflorescence at last more or less yellowish; leaves 
finely canescent. 
Plant cespitose, low, 1-1.5 dm. high; basal leaves 2-3 cm. long, 3-7 mm. 
wide. 17. O. fulvocanescens. 
Plant 2-3 dm. high; basal leaves 4-8 cm. long, 7-15 mm. wide. 
18. O. nitida. 
Corolla yellow. 19. O. dava. 
1. Oreocarya cinerea Greene. On dry plains of Colo.—Alt 5000-7000 ft.— 
Mesas near Pueblo; Canon City; Arkansas River; Rocky Ford. 
2. Oreocarya suffruticosa (Torr.) Greene. (Krynitzkia Jamesii A. Gray) 
On plains and foot-hills from S. D. and Wyo. to Colo.—Alt. 4000-8000 ft.— 
Plains and foot-hills near Boulder; Gunnison; Colorado Springs; Denver; 
