AN ECOLOGICALLY ABERRANT BEGONIA. 81 
or on the shorter capsules rounded at base: placentae 2-cleft, bearing 
seeds on both surfaces: styles 3, short, forked, with continuous loosely 
spiral papillate stigmas. 
Ledges or banks of disintegrating limestone near Jojutla, 
Morelos, Mexico (Pringle, Aug. 30,1902, no. 8690—type) ; 
similar situations on the mountains near Iguala, Guerrero 
(Pringle, Oct. 3, 1900, no. 9225; Trelease, Aug. 8, 
1903).— The sheet taken as the type is deposited in the 
United States National Herbarium, as no. 396783. 
EXPLANATION OF PLATES. 
Plate 28. — Begonia unifolia. —a, Plant, < }. b, Staminate flower, X 3. 
c, stamens, < 3. d, Pistillate flower, 3. e, Ovary, X 3. f, Cross sec- 
tion of ovary, X 3. 
Plate 29. — Habit of growth of B. unifolia, from photograph taken 
in the Iguala cafion, above Naranjo. 
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