362 BOEAGINACEAE. 



2. Tournefortia poliochros Spreng. Syst. 1: 644. 1825. 



A canescent slender woody vine 2 m. long or less, or sometimes shrubby. 

 Leaves lanceolate to ovate, 3-7.5 cm. long, thin, acuminate or acute at the 

 apex, narrowed or obtuse at the base, rather dark green and densely appressed- 

 pubescent above, densely white-pubescent beneath, the petioles 5-15 mm. long; 

 inflorescence rather short-peduncled, of few or several slender seeund spikes 

 3-7 em. long; calyx 1-1.5 mm. long, pubescent, its lobes lanceolate or ovate- 

 lanceolate ; corolla 2-3 times as long as the calyx, pubescent, its lobes lance- 

 olate, acute or acuminate; anthers included; fruit depressed, 3-4 mm. broad, 

 of 4 rounded nutlets or fewer. 



Scrub-lands, Eleuthera, Cat Island, Fortune Island, Great Ragged Island : 

 Cuba ; Hispaniola ; Jamaica. Referred to T. tomentosa Mill, in Bull. N. Y. Bot. 

 Gard. 5 : 317. WHITE-LEAVED TOURNEFORTIA. 



3. HELIOTROPIUM [Tourn.] L. Sp. PL 130. 1753. 



Herbs or shrubs, with alternate mostly entire leaves, and small blue or 

 white flowers, in scorpioid spikes, or scattered. Calyx-lobes or segments lance- 

 olate, ovate, or linear. Corolla salverform or funelform, naked in the throat, its 

 tube cylindic, its lobes imbricated, plicate or induplicate in the bud. Stamens 

 included; filaments short, or none. Stigma conic or annular. Fruit 2-4-lobed, 

 separating into 4, 1-seeded nutlets, or into 2, 2-seeded carpels. [Greek, sun- 

 turning, i. e., turning to or with the sun.] About 125 species, widely dis- 

 tributed. Type species : Heliotropium europaeum L. 



Nutlets conic, strongly ribbed, united in pairs ; flowers pale blue. 1. H.indicum. 

 Nutlets subglobose or ovoid, smooth or rugose ; flowers white or 



nearly white. 



Nutlets united in pairs. 2. H. pwviflorum. 



The four nutlets separating. 



Plants glabrous, fleshy. 3. H. curassavicum. 



Plants pubescent. 



Annual ; flowers spicate. 



Leaves obtuse. 4. H. inun datum. 



Leaves acute or short-acuminate. 5. H. Eygersii. 



Perennials. 



Flowers short-spicate : low shrub. 6. H. ternatum. 



Flowers solitary in the axils ; depressed peren- 

 nials. 

 Plants densely covered with appressed white 



hairs. 

 Leaves imbricated. 



Leaves oblong or elliptic. 7. H. nantim. 



Leaves lanceolate. 8. H. inaguense. 



Leaves scattered, linear. 9. H. diffusum. 



Plant loosely strigose. 10. H. Nashii. 



1. Heliotropium indicum L. Sp. PI. 130. 1753. 



Annual, hirsute or hispid ; stem 3-9 dm. high. Leaves ovate or oval, ob- 

 tuse, rounded or subcordate at the base, 5-15 cm. long, repand or undulate- 

 margined, petioled; flowers blue, 4-6 mm. broad, sessile in terminal dense 

 bractless, usually solitary, scorpioid spikes; calyx-segments acute, shorter than 

 the strigose corolla-tube; style very short, deciduous; fruit deeply 2-lobed, 

 glabrous, about 2.5 mm. long. 



Waste and cultivated grounds, New Providence, near Nassau : Florida, the West 

 Indies and continental tropical America. Naturalized from the Old World tropics. 

 INDIAN HELIOTROPE. 



2. Heliotropium parviflonim L. Mant. 2: 201. 1771. 



Annual, or sometimes of longer duration, loosely pubescent, branched, 2-8 

 dm. high, or vine-like and 1 m. long. Leaves oblong-lanceolate to elliptic, 7 



