476 BOEAGlNACEiE coldbnia 



12 Cryptanthe Mostly slender annuals with alternate leaves and small 

 flowers on slender deciduous pedicels ; nutlets attached from the base 

 upward to a pyramidal gynobase. 



13 Amsinckia Coarse annuals with alternate leaves and yellow flowers: 

 nutlets attached below the middle to an oblong pyramidal gynobase. 



14 Mertensia Pereniiial herbs with alternate leaves and blue or white 

 flowers on slender persistent pedicels : nutlets attached near the base 

 to a convex gynobase, wrinkled when mature and dry. 



15 Pnenmaria Maritime fleshy branching herbs with alternate leaves 

 and blue to nearly white flowers : nutlets attached just above their 

 bases to a somewhat elevated gynobase, fleshy, smooth and shining 

 when mature. 



= = Nutlets sessile, attached by the very base to a plain gynobase. 



16 Myosotls Annual or perennial herbs with white or blue flowers in 

 bractless racemes : nutlets thin-crustaceous, smooth'. 



17 Lithospermuin Perennial or annual herbs with white or yellow 

 flowers in bracted racenies : nutlets bony. 



Tribe 1 Ehretiese DC. Prodr. ix, 502. Herbs shrubs or trees. 

 Style once bifid or two-parted. Stigmas more or less capitate. Co- 

 tyledons plain. 



I COLDENIA L. Gen. n. 173. 



Low herbaceous or suflfrutescent plants with entire leaves and 

 numerous small white sessile flowers, usually in clusters. Calyx 

 5-parted, or in the origirlal species 4-parted, the divisions narrow. 

 Corolla short-funnelform or nearly salvevform, seldom much sur- 

 passing the calyx, the lobes rounded, imbricated or sometimes 

 partly convolute in the bud. Stamens included. Stj'le 2-cleft 

 or 2-parted. Stigmas more or less capitate. Ovary entire or 

 laterally 4-lobed, 4-celled. Ovules anatropous, pendulous. Fruit 

 dry, separating at maturity into 4 one-seeded nutlets, or by abor- 

 tion fewer. Seeds without albumen. 



C. Nattallil Hook. Kew Journ. Bot. iii, 296. Canescently pubescent 

 and sparsely hispid prostrate annual, repeatedly and divergently dichoto- 

 mous : leaves ovate or rhomboid- rotund, 2-4 lines long, on petioles longer 

 than the blade, with 2 or at mo?t 3 pairs of strong and somewhat curving 

 veins, the margins somewhat revolute : flowers densely clustered in the 

 forks and at the ends of the naked branches : calyx-lobes linear, sparsely 

 hispid, equalling the tube of the pink or white corolla : filaments shorter 

 than the anthers, inserted neaijly in the throat of the corolla; the tube of 

 which bears 5 short obtuse scales near the base : fruit deeply 4-lobed ; the 

 tliin-walled nutlets rounded and united only at the centre, smooth and 

 shining, oblongTOvate, marked with a linear and raphe-like ventral scar: 

 embryo straight : cotyledons very deeply horseshoe-form, their elongated 

 bases almost enclosing the radical. Arid plains, eastern Washington to 

 California, Utah and Arizona. 



Tribe ii, Hclio'ropiex Endl. Gen. 640. Leaves entire, rarely 

 denticulate. Inflorescence more or less scorpioid. Style entire, 

 gometimes wanting. Stigma peltate-annular, forming a complete 

 ^ing, surmounted usually by an entire or 2-lobed hemispherical to 



