74 



BORAGINACEAE. 



VOL. III. 



2. Heliotropium curassavicum L. Sea- 

 side Heliotrope. Fig. 3503. 

 Heliotropium curassavicum L. Sp. PI. 130. 1753. 



Annual, fleshy, glabrous throughout, more or 

 less glaucous, branched, diffuse, the branches 

 6'-i8' long. Leaves linear, or linear-oblong, 

 entire, very inconspicuously veined, 1-2' long, 

 ii"-3" wide, obtuse at the apex, narrowed into 

 petioles, or the upper sessile, sometimes with 

 smaller ones fascicled in the axils; scorpioid 

 spikes densely flowered, bractless, mostly in pairs; 

 flowers about 2" broad ; calyx-segments lanceo- 

 late, acute ; corolla white with a yellow eye or 

 changing to blue ; stigma umbrella-shaped ; anthers 

 acuminate; fruit globose, at length separating 

 into 4 nutlets. 



On sandy seashores, Delaware to Texas and Mex- 

 ico. Widely distributed in saline and maritime soil 

 in the West Indies, South America and the Old 

 World. In ballast about the northern seaports. 

 May- Sept. 



3. Heliotropium spathulatum Rydb. Spatulate- 

 leaved Heliotrope. Fig. 3504. 



H. spathulatum Rydb. Bull. Torr. Club 30: 262. 1903. 



Perennial, glabrous, fleshy, glaucous, branched, i-li 

 high, the branches ascending. Leaves spatulate, indis- 

 tinctly veined, 2' long or less, obtuse at the apex ; 

 scorpioid spikes 2-5; flowers 3"-4" broad, white, or 

 bluish; calyx-segments ovate-lanceolate, acute; fruit 

 rather larger than that of H. curassavicum. 



Prairies, plains and meadows, Iowa to North Dakota, 

 Assiniboia, Chihuahua and California. June-Sept. 



4. Heliotropium tenellum (Nutt.) Torr. 

 Slender Heliotrope. Fig. 3505. 



Lithospermum tenellum Nutt. Trans. Am. Phil. Soc. (II.) 



5: 1 88. 1833-37. 

 H. tenellum Torr. in Marcy's Rep. 304. pi. 14. 1853. 



Annual, strigose-canescent ; stem erect, slender, 

 paniculately branched, commonly leafless below, 

 6'-i8' high. Leaves linear, entire, i'-ii' long, i"-2" 

 wide, narrowed at both ends, sessile, or the lower 

 petioled ; flowers white, about 2\" long, sessile at the 

 ends of short lateral branches, bracted by i or 2 

 leaves ; calyx-segments unequal, the 2 or 3 larger 

 ones about as long as the corolla ; corolla-tube canes- 

 cent, slightly longer than the limb, its lobes entire; 

 anthers obtuse; stigma subulate-tipped; fruit de- 

 pressed, 4-lobed, strigose-pubescent, separating into 

 4 i-seeded nutlets. 



In dry soil, Kentucky to Kansas, south to Alabama, 

 Texas and New Mexico. April-Aug. 



