Heliotropium. BOKRAGINACE^E. 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. — Messersmidlia volubilis, Roem. & Sch. Syst. iv, 544 ; 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, Biijelow. 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. HELIOTR6PIUM, Tom-n. Totjrnsole, 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. Eupi.oca, 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 

 and not appendaged, strongly plicate in aestivation : 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. — Ea- 

 ploca, Nutt. 



H. convolvulaceum, 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 convolvulacea, Nutt. in Trans. Am. Phil. Soc. ser. 2, v. 180 ; 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 (Nutlull), in cultivation open nearly all day: tube 

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

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

 or appendages, but obscurely emarginatc. 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 



