BORAGINACEAE. 205 



deeply 4-lobed, forming in fruit 4 seed-like nutlets, or separating 

 into two 2-seeded nutlets; nutlets attached by the base or inner 

 angle or face to the receptacle, which is sometimes elongated (the 

 gynobase) ; endosperm none. Mature fruits are necessary for 

 accurate determinations in this family. 



Ovary undivided, sometimes 2-4-grooved, style 



terminal. 300. Heliotropium, 205. 



Ovary 4-parted; the style arising from between the 

 parts. 

 Nutlets armed with barbed prickles. 301. Lappula, 206. 



Nutlets not armed with barbed prickles. 



Corolla tubular or tubular-funnelform. 302. Mertensia, 206. 



Corolla funnelform or rotate. 



Nutlets erect, attached by the very base. 

 Racemes bractless; corolla rotate; 



roots slender. 303. Myosotis, 208. 



Racemes bracteate; corolla funnel- 

 form; roots thick. 304. Lithospermum, 208. 

 Nutlets erect or oblique, attached above 

 the base, on a more or less promi- 

 nent fruiting receptacle (the 

 gynobase). 

 Corolla yellow or orange, with naked 



open throat. 305. Amsinckia, 208. 



Corolla white or blue with prominent 

 swellings in the throat. 

 Perennials. 306. Oreocarya, 209. 



Annuals. 



Gynobase elongated, the nut- 

 lets attached for at least 



one third their length. 307. Cryptanthe, 209. 



Gynobase short, the nutlets 

 with a small scar. 

 Nutlets erect, attached 

 just inside the base; 



lower, leaves opposite. 308. Allocarya, 210. 

 Nutlets oblique or in- 

 curved, attached about 

 the middle by a long 

 process. 309. Plagiobothrys, 210. 



300. HELIOTROPIUM. Heliotrope. 



Annual or perennial herbs; leaves alternate, entire; calyx deeply 

 5-parted, persistent; corolla salverform or funnelform, the sinuses 

 more or less plaited in the bud; anthers nearly sessile; ovary 

 2-4-lobed but not divided; style terminal; fruit separating into 

 two 2-celled carpels or four 1 -seeded nutlets. 



Heliotropium curassavicum L. Perennial, glabrous and slightly glaucous; 

 stems ascending, 15-30 cm. long; leaves succulent, lanceolate to spatulate, 

 almost veinless, 2-5 cm. long; spikes in pairs, these rarely again forked, densely 

 flowered, bractless; corolla white or bluish; style very short; fruit 4-lobed, 

 separating into 4 one-seeded nutlets. Mostly in saline soil. Waitsburg, 

 Horner. 



