52 



BORAGINACEAE. 



[Vol.. III. 



2. 



Heliotropium Curassavicum L,. Sea-side Heliotrope. (Fig. 3015.) 



Heliotropium Curassavicum L. Sp. PI. 130. 1753. 

 Annual (or southward perennial?), fleshy, 

 glabrous throughout, more or less glaucous, 

 branched, diffuse, the branches 6 / -i8 / long. 

 Leaves oblanceolate, linear, linear-oblong, or 

 spatulate, entire, very inconspicuously veined, 

 i / -2 / long, ij^ // -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, bract- 

 less, mostly in pairs; flowers about 1" broad; 

 calyx-segments lanceolate, acute; corolla white 

 with a yellow eye or changing to blue; stigma 

 umbrella-shaped; anthers acuminate; fruit glo- 

 bose, at length separating into 4 nutlets. 



On sandy seashores, Virginia to Texas and Mex- 

 ico. In dry saline soil from Manitoba and the 

 Northwest Territory to Nebraska and Texas. On 

 the Pacific Coast from Oregon to Mexico. Widely 

 distributed in saline and maritime soil in South 

 America and the Old World. In ballast about the 

 northern seaports. May-Sept. 



3. Heliotropium tenellum (Nutt.) Torr. 



Slender Heliotrope. (Fig. 3016.) 



LWiospermum tenellum Nutt. Trans. Am. Phil. Soc. 



(II.) 5: 188. 1833-37. 

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



Annual, strigose-canescent; stem erect, slender, 

 panicu lately branched, commonly leafless below, 

 6 / -i8 / high. Leaves linear, entire, Yz f -\% f long, 

 j//_ 2 // w i(3 e) narrowed at both ends, sessile, or the 

 lower petioled; flowers white, about 2^2 // long, 

 sessile at the ends of short lateral branches, bracted 

 by 1 or 2 leaves; calyx-segrnents unequal, the 2 or 

 3 larger ones about as long as the corolla; corolla- 

 tube canescent, slightly longer than the limb, its 

 lobes entire; anthers obtuse; stigma subulate-tipped ; 

 fruit depressed, 4-lobed, strigose-pubescent, separ- 

 ating into 4 i-seeded nutlets. 



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

 Texas and New Mexico. April-Aug. 



4. Heliotropium convolvulaceum (Nutt.) A: Gray. Bindweed Heliotrope. 



(Fig. 3017.) 



Euploca convolvulacea Nutt. Trans. Am. Phil. Soc. 



(II.) 5=189. I833-37- 

 H .convolvulaceum A. Gray, Mem. Am. Acad. 0:403. 1857. 



Annual, strigose-canescent, usually much branch- 

 ed, 6 / -i5 / high, the branches ascending. Leaves 

 oblong, ovate, or lanceolate, entire, short-petioled, 

 obtuse or acute at the apex, narrowed at the base, 

 %'-!%' long; flowers numerous, fragrant, very 

 short-peduncled, terminal and lateral, mostly 

 solitary and opposite the leaves; calyx-segments 

 lanceolate, acuminate, equal; corolla white, stri- 

 gose, 8 // -io // long, about 6 V broad, its tube 

 narrowed at the throat, longer than the calyx 

 and the angulate-lobed limb; anthers inserted 

 on the tube of the corolla, slightly cohering by 

 their tips; style filiform; stigma with a tuft of 

 bristly hairs; fruit 2-lobed, pubescent, each lobe 

 splitting into 2 i-seeded nutlets. 



In dry sandy soil, Nebraska to Texas, Utah, and 

 Mexico. July-Sept. 



