83 BOREAGINAClijK. 



* * Nutlets faxd to a prominent base (gynobase) by some part of the inner angU or /aee: 



corolla imbricated. 

 Nutlets not armed -with prickles, not appendaged. 



Corolla blue or whitish: smooth glaucous perennials. 4 



Corolla yellow: hispid annuals • 6 



Corolla 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 hooked or barbed prickles, or fiat and wing-margined. 

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



Kacemes bracteate at base: nutlets erect, prickles barbed 9 



Bacemes 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. HELIOTSOPIUSI, Toumefort. 



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



2. LITHOSPEBMUM, Toumefort. 

 Calif ornicum, Gr. Corolla 9 or 10 lines long: throat exceeding lobes, 

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



3. MYOSOTIS, Linnaeus, 

 vema, Nutt. Hispid calyx unequal: corolla white, small. Oregon, 

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



4. MERTENSIA, Roth. 



1. IS., maritima, Don.. Corolla 3 or 4 lines long, tube shorter than calyx. 



2. M. Siberica, Don. Corolla-tube much 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, convex and ridged on the back, rough 3, 4, 6 



1. A. vemioosa, H. & A. Sparingly hispid: corolla-tube a little exserted. 

 Var. grandiflora, 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 whitish or tawny hispid: corolla 2 or 3 linea. 



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



