88 BORRAGINACE^. 



* * Nutlets fixed to a prominent hose (gynohase) hy some part of the inner angle or face: 



corolla imbricated. 

 Nutlets not armed with prickles, not appendaged. • 



CorcUa blue or whitish: smooth glaucous perennials 4 



Corolla yellow: hispid annuals 5 



OoroUa white, mostly yellow-crested in the throat: hirsute or hispid. 



Nutlets erect and straight: calyx in fruit not rotate 6 



Nutlets oblique or incurved on a rounded base 7 



Corolla blue, rotate: a dwarf alpine tufted perennial 8 



Nutlets armed with h9oked or barbed prickles, or flat and wing-margined. 

 Corolla blue, purple or white; throat with a ring of 2-lobed crests. 



Racemes bracteate at base: nutlets erect, prickles barbed 9 



Racemes on naked peduncles: nutlets globose 10 



Corolla minute, white: flowers scattered along leafy branches. 



Nutlets flattened, forming an x-shaped or star-like bur. 11 



1. HELIOTROPIUM, Tournefort. • 

 1. H. Curassavicum, L. Nearly or quite prostrate: corolla bluish or white, 



2. LITHOSPERMUM, Tournefort. 



1. L. Californicxun, Gr. Corolla 9 or 10 lines long: throat exceeding lobes. 



2. L. pilosum, Nutt. Corolla greenish yellow, silky, 5 or 6 lines long. 



3. MYOSOTIS, Linnaeus. 



1. M. verna, Nutt. Hispid calyx unequal: corolla white, small. ^ Oregon. 



2. M. sylvatica, Hoffm. var. alpestris, Koch. Corolla blue, 3 or 4 lines broad. 



4. MERTENSIA, Roth. 



1. M. maritima, Don. Corolla 3 or 4 lines long, tube shoiter than calyx. 



2. M. Siberica, Don. Corolla-tub? mvich exserted: calyx lobes obtuse. 



5. AMSINCKIA, Lehmann. 



Nutlets sharply 3-angled, straight, smooth, shining 1 



Nutlets broad; the back nearly flat, wavy-wrinkled cross-wise - 2 



Nutlets incurved, conv6x and ridged on the back, rough 3, 4, 5 



1. A. vernicosa, II. & A. Sparingly hisijid: corolla-tube a little exserted. 

 Var. gfrandiflora, Gr. Very bristly-hispid: corolla-tube longer, limb broader. 



2. A. tessellata, Gr. Coarsely hispid: leaves mostly obtuse: calyx rusty. 



3. A. intermedia, F. & M. Calyx whiti!>h or tawny hispid : corolla 2 or 3 lines. 



4. A. spectabilis. F. & M. Corolla bright orange much exserted. 



