A 
AA. 
Key to principal species of Datura 
sect. Brugmansia Pers. (cf. Plate XX VII). 
. Leaves angular to repand, apex acute to obtuse; flowers mostly 
red (rarely yellow), 17-25 cm., their corolla teeth not exceed- 
ing 2cm.; anthers 1.2-1.8 em.; fruit ovoid to oblong-elliptic ; 
seeds rounded, verruculose. . .... .. . . WD. sanguinea 
Leaves entire (rarely coarsely dentate), apex acute to acuminate ; 
flowers white (rarely yellow or slightly reddish), 17-45 em., 
their corolla teeth much exceeding 2 cm.; anthers 2.5-4 cm.; 
fruit elongate; seeds angular or irregularly ridged. 
B. Calyx 1.5-3 cm. broad, usually 1-3-toothed; flowers rarely 
exceeding 30 cm., the slender basal part of the corolla tube 
not visible or reaching only the calyx tip; corolla teeth 4-9 
em.; anthers distinct; fruit oblong-cylindrie to fusiform; 
seeds with a greatly thickened suberose testa. . . D. candida 
BB. Calyx 2-4 cm. broad, usually 3—5-toothed; flowers often ex- 
ceeding 30 cm., the slender basal part of the corolla tube con- 
spicuously exceeding the calyx, corolla teeth 2—5 cm. ; anthers 
connivent; fruit fusiform (rare); seeds lacking a thick sub- 
erose testa. . .......... . . . . D. suaveolens 
1. Datura sanguinea Puiz & Pavon FI. Peruv. 2: 
15. 
1799. 
Brugmansia bicolor Persoon Syn. Pl. 1: 216. 1805; 
Lindley Bot. Reg. 20: pl. 1789. 1834. 
B. sanguinea D. Don in Sweet Brit. Fl. Gard. II. 3: 
pl. 272. 18385; Lagerheim Bot. Jahrb. Engl. 20: 662. 
1895. 
Small trees, 2-5 meters in height; leaves soft-pubes- 
cent, the lower repand to angular, the upper usually 
entire; flowers 17-25 cm. long, the corolla with a short- 
toothed, recurved to strongly reflexed (rarely erect) limb, 
the tube typically green within the calyx, yellow at the 
middle, and red or orange-red (rarely yellow-orange or 
bronze) toward the limb, the ribs yellow; anthers 1.2-1.8 
em., beneath an obtuse stigma; fruit ovoid (rarely 
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