718 BORAGINACEAE 



Basal leaves with long loose pubescence; dorsal surface of the nutlets smooth ; corolla 

 5-6 mm. wide. 2. E. elongatum. 



Dorsal surface of the nutlets with a toothed border; corolla 4-6 mm. wide. 



3. E. argenteum. 



1. E. Howard! (A. Gray) Rydb. Floral branches 1-10 cm. long, canescent- 

 strigose; leaves linear-oblanceolate, canescent or yellowish strigose; corolla dark 

 blue; outlets broadly obconic, oblique, 2 mm. long and broad; dorsal surface 

 oval, almost flat. Cynoglossum and Omphalodes Howardii A. Gray. Dry hills : 

 Mont. Wyo. Wash. Submont. My-Jl. 



2. E. elongatum (Rydb.) Wight. Floral branches 1-10 cm. long; leaves 

 of the caudex closely overlapping, 5-8 mm. long, oblong or oblanceolate, those 

 of the flowering branches linear or linear-oblong, loosely silky- villo us; corolla 

 light blue; nutlets about 2 mm. long, oblique; dorsal surface ovate, smooth and 

 shining. E. aretioides elongatum Rydb. Hills and mountains: Mont. N.M. 

 Ore. Mont. Alp. Je-Jl. 



3. E. argenteum Wight. Floral branches 1-5 cm. high, loosely silky; 

 leaves of the caudex closely overlapping, oblanceolate or oblong, 5-10 mm. long; 

 those of the flowering branches linear-lanceolate, silky villous; corolla bright 

 blue, rarely white, 4-6 mm. broad; nutlets about 2 mm. long. Eritrichium nanum 

 aretioides A. Gray, not Herder. Omphalodes nana aretioides A. Gray. Oreo- 

 carya pulvinata A. Nels., white-flowered form. High mountains: Colo. Utah 

 (? Wyo.) Jl-Au. 



7. GREENEOCHARIS Guerke & Harms. 



Depressed, spreading annuals. Leaves alternate, linear, hirsute. Flowers 

 perfect, regular, sessile, leafy-bracted. Calyx 5-cleft, the upper portion decidu- 

 ous, the lower persistent around the fruit. Corolla salver-shaped; tube short; 

 throat open, naked; limb 5-lobed. Nutlets oblong-ovate, attached by a narrow 

 groove bifurcate at the base for nearly their whole length to a pyramidal-subulate 

 receptacle. [Piptocalyx Torr.] 



1. G. circumscissa (H. & A.) Rydb. Stem depressed, divaricately branched 

 and spreading, 3-10 cm. high, hispid; leaves linear, 5-15 mm. long, hispid; flowers 

 crowded at the ends of the branches, leafy-bracted; corolla white, 1 mm. long; 

 nutlets oblong-ovate, smooth or minutely scabrous. P. circumscissus Torr. 

 Desert plains: Wash. Wyo. Ariz. Calif. Son. Plain. My. 



8. PLAGIOBOTHRYS Fisch. & Mey. POPCORN FLOWER. 



Low, commonly diffuse annuals. Leaves alternate, narrow, entire. Flow- 

 ers perfect, regular, in scorpioid racemes. Calyx 5-lobed, persistent. Corolla 

 salverform, white; tube very short. Nutlets attached at or near the middle, to 

 a globular or depressed receptacle, ventrally carinate above the insertion, rugose 

 or rough, rarely smooth, only one or two maturing, succumbent horizontally 

 and tardily detached, leaving a caruncle at the insertion. 



Receptacle subglobose or depressed, not 4-sulcate; nutlets only 1 or 2 maturing, hori- 

 zontally incumbent; plants with tufted basal leaves. 



Nutlets cruciform; basal leaves rosulate; cauline few and small. 1. P. tenellus. 

 Nutlets broadly ovate; stems leafy throughout. 2. P. arizonicus. 



Receptacle deeply 4-sulcate, after the falling of the nutlets; nutlets all 4 maturing, in- 

 curved. 3. P. Kingii. 



1. P. tenellus A. Gray. Stem branched at the base, hirsute; basal leaves 

 numerous, rosulate, oblanceolate, 1-2 cm. long, hirsute; stem-leaves few and 

 small, linear-lanceolate; calyx hirsute, with yellowish or brownish hairs; corolla 

 white, 1.5 mm. broad; nutlets contracted both at the base and the apex, with 

 transverse wrinkles. Sandy soil: B.C. Ida. Calif. Son. Ap-Je. 



2. P. arizonicus (A. Gray) Greene. Stem branched from the base, hirsute; 

 branches ascending or decumbent at the base, 2-3 dm. high; basal leaves oblance- 

 olate to linear, 2-5 cm. long, hirsute; stem-leaves lanceolate or linear-lanceolate; 

 calyx hispid; corolla white, nearly 2 mm. wide; nutlets ovate, somewhat cross- 

 wrinkled and with a few tubercles on the ridges. Sandy soil: Ariz. s Utah 

 s Calif. L. Son. Ap-My. 



