HELIOTEOPIACEAE. 127 



3. BOURRER.IA P. Br. Shrubs or trees. Flowers in corymbose cymes. 

 Sepals united to above the middle. Corolla white or colored, prominently 

 lobed. Filaments adnate to above or below the middle of the corolla-tube. 



Leaf-blades short-petioled : free portions of the filaments short, about as long as the 

 anthers. 1. B. revoluta. 



Leaf-blades slender-petioled : free portions of the filaments several 



times longer than the anthers. 2. B. ovata. 



1. B. revoluta H.B.K. Shrub or small tree: 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 56 mm. wide : anthers 

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

 mocks, Key West. [E. K.] (Cuba, Ant.) BOUGH- STRONGBACK. 



2. B. ovata Miers. Shrub or small tree, with glabrous twigs: leaf -blades 

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

 mm. 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. Hammocks, U. keys, L. 

 keys. (Bah., Cuba, Ant.) STRONGBACK. 



FAMILY 6. 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. Gynoecium 2-4-carpellary. Stigma annular, sur- 

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



Shrubs, trees or woody twiners : fruit drupaceous. 1. TOCRNEFOHTIA. 



Herbs or shrubby herbs : fruit dry, separating into nutlets. 2. HELIOTBOPIUM. 



1. TOUBNEFOBTIA 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. gnaphalodes. 



Plants minutely and inconspicuously pubescent : leaves relatively 



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



1. T. gnaphalodes (Jacq.) E. 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. 

 Coastal sand-dunes and hammocks, U. S. keys, U. keys, L. keys, L. S. keys. 

 [E. K.] (Ber., Bah., Cuba, Ant.) SEA-LAVENDER. 



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 and 

 thickets, U. keys, L. keys. (Bah., Cuba, Ant.) 



2. HELIOTBOPIUM [Tourn.] L. Plants erect, diffuse or prostrate. 

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

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



Corolla white, except the sometimes colored " eye," or turning blue, less than 5 mm. 

 long. 



