184 BORRAGINACEiE. Heliotropium. 



lobes obtuse (with one exception) and usually broad : inflorescence in most species 

 either distinctly or indistinctly scorpioid. — § Euheliotr opium & Orthoslachys, 

 Benth. & Hook. Gen. ii. 844. Heliotropium & Schleidenia (Endl.), Fresenius in 

 Fl. Bras. viii. 31, 33. 



* Flowers all or some of them accompanied by bracts or leaves; when spicate, the so-callerl spikes 

 not naked, nor conjugate or forking to form a cyme, nor strongly coiled: anthers generally with 

 tips connivent or cohering over the stigma. — § Orthostuchys, li. Br.; A. DC; Benth. &"l-Iook. 

 Preslea, Mart. Schleidenia, Endl. 



•i— Stigma-tip elongated (sometimes 2-cleft): anther-tips lightly or only at first cohering: corolla 

 with naked and open throat, white: leaves narrowly linear: nutlets globular, beakless, externally 

 liisi)id or pubescent. 



•H- Divisions of the calyx similar, more or less shorter than the tube of the corolla: nutlets with a 

 pair of pits on the inner face. 



H. Greggii, Torr. A span high, diffusely spreading from a slightly woody base, strigose- 

 cinereous : slender branches leafy : leaves narrowly linear, flat, about an inch long and a 

 line wide: flowers short-pedicelled or almost sessile in an at first crowded and short scor- 

 pioid spike, with or often mainly without bracts : corolla with an ample and slightly 

 5-lobed limb : anthers long, acuminate, minutely bearded at tip : stigma-tip subulate- 

 conical, much thicker than the very short style, as well as much longer. — Bot. Mex. Bound. 

 1.j7 ; Gray, Proc. Am. Acad. x. 49. — Sandy or gravelly soil, western borders of Texas, New 

 Mexico, and adjacent part of Mexico, first collected by Dr. Gregtj. Flowers very fragrant : 

 corolla a third to nearly half an inch broad when expanded. 



H. angustifolium, Torr. A span to a foot high, erect and densely branched from a 

 woody base, strigose-canescent : branches rigid, very leafy: leaves very narrowly linear, 

 with revolute margins, almost filiform when dry (4 to 9 lines long) : spike few-flowered, at 

 length slender, nearly straight, bracteate at base or without bracts : flowers small, short- 

 peduncled : corolla salverform, with narrow canescent tube and 5-parted limb ; the lobes 

 ovate-lanceolate (acute!); hardly a line long, or half the length of the tube: anthers with 

 mucronate glabrous tips : stigma-tip slender-subulate, longer and hardl3'^ broader than the 

 rather long style. — Bot. Mex. Bound. 137. — South-western borders of Texas, Wri(jht. 

 (Adjacent Mex., Grer/rj.) 



++ -H- Divisions of the calyx very unequal, the larger about the length of the corolla : nutlets 

 without pits on the inner face: inflorescence not in the least scorpioid. 



H. tenellum, Torr. A span to a foot high, erect from an annual root, paniculately 

 branched, slender, strigose-canescent : leaves narrowly linear, with more or less revolute 

 margins (about an inch long and a line wide) : flowers scattered, terminal, becoming lateral 

 and axillary, on rather slender peduncles, many of them bractlcss : limb of the corolla 

 rather shorter than the narrow canescent tube; the lobes oblong or obovate, a line long: 

 anthers oblong and with nearly naked blunt tips scarcely at all cohering : stigma-tip nar^ 

 rowly subulate, 3 or 4 times the length of the short style. — Torr. in Marcy Kep. t. 14, & 

 Bot. Mex. Botmd. 138. Lithoapernmm tenellum, Nutt. in Trans. Am. Phil. Soc. ser. 2, v. 189. 

 L. anf/usti/oliitm, Torr. in Ann. Lye. ii. 225, not Michx. — Open dry ground, Kentucky to 

 Alabama, west to Kansas and throughout Texas. 



•1— -I— Stigma-tip conical or more slender: anthers cohering by minutely bearded tips: corolla 

 appendaged and throat sometimes almost closed by a pubescent projection or gibbosity at or below 

 the base of each fold of the sinuses: divisions of the calyx usually of unequal breadth: nutlets 

 in our species beakless. 



•H- Diffuse or tufted, a span or less high : internal appendages of the corolla small roundish puber- 

 ulent gibbosities low in the throat. 



H. COnf ertifolium, Torr. Sutfruticulose, very much branched and tufted, silvery-white 

 with a dense silky-hirsute pubescence: leaves crowded throughout and imbricated along 

 the upper part of the branches, from narrowly oblong to linear, 2 or 3 lines long, equally 

 white both sides, the margins somewhat revolute : inflorescence not in the least scorpioid : 

 flowers sessile among the leaves, mainly glomerate with them at the end of the branches 

 and hardly surpassing them : corolla pale purple; its silky-hairy tube hardly longer than 

 the calyx ; limb angulate-5-lobed, only 2 lines in diameter : style thrice the length of the 

 ovary: annular stigma much broader than the subulate-conical tip. — Herb. Torr. //. lim- 

 batum & var. ronf< rti folium, 'Yovr. Bot. Mex. Bound. 138, not H. Umhatum, Benth. — South- 

 western borders of Texas, Berlandler, Wrirjkt, &c. (Adjacent Mex.) 



