Heliotropium. BORRAGINACE^. 183 



* Lobes of the small white corolla slender-subulate, valvate-induplicate in the bud. 



T. Volubilis, L. Slender shrub, with filiform sarmentose more or less twining branches, 

 and minute usually rusty pubescence : leaves ovate or oblong-ovate, acute or acuminate, 

 slender-petioled : spikes of the loose cyme filiform and divaricate : slender flowers merely 

 2 lines long : drupe 1-3-seeded. — Messersmidtia volubilis, Roem. & Sch. Syst. iv. 644 ; Miers 

 Contrib. ii. 210. — Keys of Florida. ( W. Ind., &c.) 



* * Lobes of the white corolla broad, more or less plicate in the bud and undulate. 



T. mollis, Gray. Erect from a suffrutescent base, a foot or less in height, branching, 

 canescently silky-tomentose : leaves deltoid- or rhombic-ovate, obtuse, and with undulate 

 margins, rather long-petioled : flowers middle-sized, crowded in a pair of naked peduncled 

 spikes : tube of the corolla a little longer than the calyx, and longer than the rounded un- 

 dulate or crenulate lobes : drupe globose-ovate, minutely tomentose, excavated at base, 

 by abortion about 2-seeded. — Proc. Am. Acad. x. 50. Heliophytum molle, Torr. Bot. Mex. 

 Bound. 138. — On the Rio Grande, Texas, at or opposite Presidio del Norte, Bigelow. Leaves 

 about 2 inches long, including the petiole. Corolla apparently white, 3 lines long, the 

 limb rather ample. Fruit probably fleshy in the living plant. 



T. gnaphalodes, R. Br. Somewhat fleshy shrub, very white silky-tomentose through, 

 out, thickly leafy : leaves spatulate-linear, obtuse : flowers densely clustered : corolla 

 fleshy, downy outside : drupe ovate-conical, deeply excavated at base, with thin flesh, 

 and 2 two-seeded nutlets. — Heliotropium gnaphalodes, Jacq. Amer. 25, t. 173. (Pluk. Aim. 

 t. 193, fig. 5.) — Coast of Florida. (W. Ind.) 



6. HELIOTROPIUM, Tourn. Tournsole, Heliotrope. (Ancient 

 Greek name, not indicating that the flowers turn to the sun, but that they begin 

 to appear at the summer solstice.) — Herbs, or low more or less shrubby plants, 

 belonging mainly to the warmer parts of the world, represented in cultivation by 

 the vanilla-scented H. Peruvianum, and in the southern part of the United States 

 by several indigenous and two or three naturalized species: fl. all summer. — 

 Gray, Proc. Am. Acad. x. 49 ; Benth. & Hook. Gen. PI. ii. 843. 



§ 1. EuPLOCA, Gray, 1. c. Fruit didymous, solid ; the two carpels each split- 

 ting into two almost hemispherical one-seeded nutlets, their internal face flat and 

 smooth : embryo semicircular in rather copious albumen : corolla large, naked 

 arid not appendaged, strongly plicate in sestivation : anthers slightly cohering by 

 their minutely bearded tips : style long and filiform : cone of the stigma truncate 

 and bearded with a penicillate tuft of strong bristles : flowers scattered. — Eu- 

 ploca, Nutt. 



H. COnvolvulaceura, Gray. Low spreading annual, strigose-hirsute and hoary, much 

 branched : leaves lanceolate, or sometimes nearly ovate and sometimes linear, short-peti- 

 oled : flowers generally opposite the leaves and terminal, short-peduncled : limb of the 

 bright white corolla ample, angulate-lobed ; the strigose-hirsute tube about twice the length 

 of the linear sepals: anthers inserted at or above its middle. — Mem. Am. Acad. vi. 403, 

 & Proc. V. 340. Euploca convohmlacea, Nutt. in Trans. Am. Pliil. Soc. ser. 2, v. 189 ; Hook. Ic. 

 t. 651 ; Torr. in Marcy Rep. t. 15. E. grandiflora, Torr. in Emory Rep. 147. — Sandy plains, 

 Nebraska to W. Texas. Soda Lake, S. E. California, Dr. Cooper. A showy plant ; the 

 sweet-scented flowers opening at sunset (Nutlall), in cultivation open nearly all day : tube 

 of corolla (including the abruptly somewhat dilated throat, constricted at orifice) 4 hues 

 long; the rotate border about half an inch broad ; the wide sinuses not produced into teeth 

 or appendages, but obscurely emarginate. Style fully thrice the length of the ovary : 

 annular stigma obscurely 4-lobed ; its strongly bearded terminal appendage rather longer, 

 truncate or obscurely 2-lobed. Fruit somewhat pubescent or hairy. 

 § 2. EuHELiOTROPiuM. Fruit 4-lobed and separating at maturity into 4 one- 

 celled one-seeded nutlets : style usually short : cone or tip of the stigma slightly 

 bearded or naked, rarely obsolete : corolla plicate or induplicate in the bud ; the 



