57. BEGONIACE/E. 43 



57. Begoniaceae. 



Begonia Linn. 

 Key to tli£, Formosan Species. 



( 1 ) Lecaves quite glabrous. (2) 



Leaves more or less hairy. (4) 

 ( 2 ) Leaves broadly rounded B. Jcotoensis. 



Leaves oblong or lanceolate. (3) 

 ( 3 ) Fruits winged on one side B. taiwaniana. 



Fruits entirely wingless B. aptera. 



( 4 ) Leaves ferrugineo-hirsute B. ferruginea. 



Leaves not ferrugineo-hairy, but very slightly beset with minute 

 hairs. (5) 

 ( 5 ) Leaves palmately lobate B. sinensis. 



Leaves slightly lobate or not lobate B. laciniata vm\ formosana. 



Begonia aptera Hayata Materials for a Flora of Formosa p. 122. Stem 

 strong, 40-50 cm. high, branched, glabrous, branches divaricate. Leaves long 

 petiolate oblique oblong 14 cm. long 6 cm. broad, obtuse at the apex-, base 

 very oblique, acute or truncate on the upper side, cordate or aiu-iculate on 

 the lower side, auricles 2 cm. long as broad, remotely minutely mucronately 

 serrate, serras 12 mm. distant, 6-7-nerved, glabrous on both sides, shining 

 above, dull beneath, petioles 4 cm. long, stipules lanceolate 7 mm. long. 

 Fruits capsulaa' depresso-globose, 12 mm. long, 14 mm. broad, depressed at 

 the apex, 3-celled, wings obscure or 0. 



Hab. Randaizan, Shintiku, Goshizan. 



Near B. Wageneriana Hook. f. Bot. Mag. t. 4988, from which the pre- 

 sent plant differs in having very small wings of the fruits ; it resembles 

 B. micropte.ru Bot. Mag. t. 4974, in respect of small wings of capsules, but 

 diifers from that in having entire sepals and obscurely and remotely serrate 

 leaves. Also near B. Boxburgi A. DC. and B. infiata C. B. Claeke, but 

 differs from the both in having not horned, but quite rounded, fruits. 



