114 HELIOTROPIACEAE. 



1. B. revoluta H.B.K. Small tree or shrub, with pubescent twigs: leaf -blades 

 oblong to obovate, mostly 2-7 cm. long, abruptly pointed, rounded or notched, 

 permanently rough-pubescent and ciliate, or sometimes smooth: cymes several- 

 flowered: calyx 6-7 mm. long; lobes ovate, mostly less than J as long as the 

 tube: corolla white; tube much exceeding the calyx; larger lobes 5-6 mm. 

 wide: anthers about 2.5 mm. long: drupes orange, slightly depressed, 9-11 mm. 



Wide. EOUGH- STRONGBACK. 



Hammocks and pinelands, E. Keys and F. Keys. (W. I.) 



2. B. cassinifolia (A. Rich.) Griseb. Shrub: leaf -blades oval, elliptic, obo- 

 vate, or cuneate, 1-2.5 cm. long, mostly obtuse or retuse, smooth, glabrous, and 

 eciliate, at least at maturity, slightly veiny in age: cymes f ew-flowered : calyx 

 5-6 mm. long; lobes triangular to ovate-triangular, ^ as long as the tube: 

 corolla white; tube about as long as the calyx or slightly exceeding it; larger 

 lobes about 4 mm. wide: anthers about 2 mm. long: drupes much depressed, 

 7-8 mm. wide. SMOOTH-STRONGBACK. 



Pinelands, E. Keys. (W. I.) 



3. B. ovata Miers. Small tree or shrub, with glabrous twigs: leaf-blades 

 obovate to oblong-obovate or oval-obovate, 4-12 cm. long, smooth : calyx 6-7 cm. 

 long; lobes triangular, fully J as long as the tube: corolla white; tube rather 

 short; lobes slightly shorter than the tube: stamens exserted; anthers about 

 2 mm. long: drupe orange, about 1 cm. wide. STROXGBACK. 



Hammocks, F. Keys. (W. I.) 



FAMILY 4. HELIOTROPIACEAE. HELIOTROPE FAMILY. 



Herbs, shrubs, or woody vines. Leaves alternate: blades entire, or 

 rarely toothed. Flowers perfect, mostly in scorpioid spikes or racemes. 

 Calyx of 5 more or less united sepals. Corolla various, of 5 partially 

 united petals. Androecium of 5 stamens, the filaments more or less adnate 

 to the corolla-tube. G-ynoecium 2-4-carpellary. Stigma annular, sur- 

 mounted by an appendage. Fruit drupaceous, or dry and of 2-4 nutlets. 



Fruit drupaceous. 1. TOURNEFORTIA. 



Fruit dry, separating into nutlets. 2. HELJOTBOPIUM. 



1. TOURNEFORTIA L. Plants erect or climbing. Sepals well united 

 (ours). Corolla white or pale. Stamens adnate to near the top of the corolla- 

 tube. Fruit drupaceous. 



Plants densely and conspicuously silky-tomentose : leaves very numerous and crowded : 

 corolla-lobes ovate to suborbicular. 1. T. gnaphaloides. 



Plants minutely and inconspicuously pubescent : leaves rela- 

 tively few and distant : corolla-lobes lanceolate to subulate. 2. T. volulilis. 



1. T. gnaphaloides (Jacq.) R. Br. Fleshy shrub, 3-18 dm. tall, the pubescence 

 white or whitish: leaf -blades linear-spatulate, 4-10 cm. long: calyx-lobes shorter 

 than the tube: corolla-lobes 2-3 mm. long: fruit ovoid, about 5 mm. long. 

 SEA-LAVENDER. 



Coastal sand-dunes, s. pen. Fla. and the F. Keys. (W. I.) 



2. T. volubilis L. Woody vine, the pubescence usually rusty: leaf -blades ovate 

 to oblong-lanceolate, 2-6 cm. long: calyx-lobes longer than the tube: corolla- 

 lobes about 1 mm. long: fruit depressed, 2.5-3 mm. wide. 



Hammocks, F. Keys. (W. I.) 



2. HELIOTROPIUM [Tourn.] L. Shrubs or erect, diffuse or prostrate 

 herbs. Sepals nearly distinct. Stamens adnate to the lower part of the corolla- 

 tube. Style very short. Fruit 4-lobed, an aggregate of 4 nutlets. 



