7 20 BORAGIN ACEAE 



Corolla 4-5 mm. broad; nutlets hoaeycomb-crested. . 



10. O. Baken. 



Calyx-lobes lanceloate to linear, much exceeding the nutlets; inflor- 

 escence thyrsoid. ^ i, n - 

 Inflorescence a broad, open, round-topped thyrsus; branches usuauj 



again branched. ^ ^ i «^ 



Plant tall, 2 dm. high or more; nutlets with acute backs and 



sharply acute margins; tubercles united into more or 

 less distinct cross-ridges; biennials, with taproots. 

 Nutlets wing-margined, with the strong, rather regular cross- 

 ridges uniting on the back. 11. O. mrgmensis. 

 Nutlets merely acute-angled, weakly irregularly cross-ridgea. 



12. O. thyrstflora. 

 Plant low, cespitose perennials, 1-2 dm. high; nutlets with 

 rounded backs; murications united into star-shaped tuoer- 

 cles. 13. O. aperta. , 



Inflorescence, at least in flowers, narrow, almost spike-like, if uiore 



open, the branches simple. „+, 



Plants green, very hispid, only the basal leaves canescent. 



bristles with conspicuous pustulate bases, much longer 

 than the short strigose or tomentose pubescence. 

 Leaves linear or narrowly linear-lanceolate; plant I--2 urn. 



high, very slender. 14. O. Macounix. 



Leaves, at least the basal ones, broadly oblanceolate or 



spatulate. ^, „ v^oif 



Corolla 7-10 mm. broad; nutlets ovate, more than nan 



as broad as long. 

 Leaves obtuse; inflorescence dense. «^nf ■ 



Basal leaves broadly spatulate. usually canesceni). 



stem 1-3 dm. liigh. 15. O. olomerata. 



Basal leaves ol^lanceolate. greener; stem usuauy 

 3-4 dm. high. 16. O. affims. 



Leaves acute, strongly hirsute-cihate; inflorescence 

 not very dense. 17. O. spicuhfera. 



Corolla 5-7 mm. broad; nutlets lanceolate, less tn^i 

 half as broad as long; basal leaves oblanceolate, some- 

 what canescent ; plant 1-3 dm. high. 



Plant canescent; at least the basal leaves with inconspicuous 



bristles scarcely longer than the other pubescence. 

 Plant stout, 2-4 dm. high, rather simple; coroHa 7-lU u™- 



broad 19. O. argentea. 



Plant low. less than 2 dm. high, densely cespitose. .^^^1^ 



Basal leaves narrowly linear-oblanceolate, glossjr ciosei> 

 appressed-canescent; nutlets manmiillate-papiuosc. 



20. O- carta. 

 Basal leaves spatulate. white or yellow, scarcely glossy, 



at least when mature. , , ^ _^^. ^^^ut- 



Nutlets 1 or 2, acuminate with a blunt apex, caijA 



lobes linear-subulate. 21, O. nana 



Nutlets 4. merely acute; calyx-lobes lanceolate. 



Nutlets more or less rugulose; tubercles more or 



less confluent. „i,- +nhft 



Inflorescence in fniit rather open; corqlia-xuo« 



slightly exserted. 22, O- ^P^l^^^^i ex- 



Inflorescence congested; coroUa-tube nov ca 



serted. 



Corolla 7-9 mm. broad. ^ . ^ 



23. O. sericea. 



Corolla 4-6 mm. broad. Tinflpts 



Leaves tomentose and hispid, nutiew* 



tuberculose-rugulose. 



24. O- depressa. 

 Leaves strigillose and hispid; nutlets 



sinuately and finely rugulose 



25. O. caespitosa. 



Nutlets muricate. ^ ^ +1,0^1 i 



Inflorescence narrow; plant not more tnau 



dm. high. 



Leaves strigillose and luspid. ^.^..• 



° 26. O. Shantzit. 



Leaves subtomentose and hispjd- 



27. O. dolosa. 



Inflorescence open; plant 1-2 dm. *"^: ,_ 



28. O. commixta. 



Nutlets smooth. 29. O- salmonensts. 



Corolla-tube long-exserted; cespitose perennial, rarely biennial. 

 Corolla white. 



Nutlets rough, n ^ 



Nutlets more or less distinctly rugose, with irregular cross-ridges, as wc 

 muricate. 



