12 WILSON EXPEDITION TO CHINA 



Western Szech'uan: Mupin, alt. 1800 m., June 1908 (No. 

 n88 a ). 



From all the allied species this is easily distinguished by the nearly sessile leaves 

 of the flowering branches; the other species with nearly sessile leaves, D. pilosa 

 Rehder, D. Faberi Render, and D. Sieboldiana Maximowicz, are too different to 

 be confounded with D. subsessilis. 



Deutzia discolor Hemsley in Jour. Linn. Soc. XXIII. 275 (1887). 



Hupeh: Patung distr., A. Henry (Nos. 5426, 5718); Hsing-shan 

 Hsien, thickets, alt. 1200-1500 m., June and November 1807 (No. 

 570, 2886, 2887, 2888); without locality (Veitch Exped. Nos. 190, 710, 

 1916 b , 2335, 2335 a ). Southern Shensi: Mt. Tun-u-sse, June 16-18, 

 1894, G. Giraldi (No. 771). 



Deutzia discolor shows considerable variation in the size of the flowers, density 

 and size of the inflorescence and in the shape of the filaments. A very large-flow- 

 ered form has been distinguished as D. discolor var. major Veitch, Cat. 1905, fig. 

 ex Kew Bull. Misc. Inform., 1906, appx. I. 67; Novelties for 1907, 14. The 

 No. 2887 has the flowers white and pink, but does not differ otherwise from 

 D. discolor. 



Deutzia densiflora, Rehder, n. sp. 



Frutex bimetralis ramulis robustis, junioribus floriferis glabris v. 

 fere glabris, foliiferis parce stellato-pilosis, annotinis rubro-fuscis cor- 

 tice detersili. Gemmae perulis late ovatis abrupte acuminulatis stel- 

 lato-pilosis. Folia membranacea, ovato-oblonga v. oblonga, acuta v. 

 breviter acuminata, basi rotundata v. interdum late cuneata, argute 

 serrulata, 4-7 cm. longa et 1.5-2.8 cm. lata, supra obscure viridia, 

 pilis 4-5-radiatis sparse conspersa, subtus canescentia, dense pilis 

 9-12-radiatis obtecta, utrinsecus 5-6-costata; petioli stellato-pilosi, 

 2-4 mm. longi. Cyma densa, late pyramidalis, ad 7 cm. longa et 6 

 cm. diam., fere glabra, in apice ramulorum perbrevium plerumque 

 paribus foliorum duobus in axillis cymas partiales gerentibus instruc- 

 torum; pedicelli stellato-pilosi, tubum calycis stellato-pilosi sub- 

 aequantes, dentes calycis ovati, abrupte acuminulati, tubo paullo 

 breviores; petala elliptico-oblonga, alba, extus sparse stellato-pilosa, 8-9 

 mm. longa; stamina petalis tertia parte breviora, filamenta exteriorum 

 apice manifeste dentata, dentibus triangularibus stipitem antherae 

 plerumque subaequantibus v. paullo superantibus, interiorum an- 

 guste oblonga, apice obtusa v. obsolete denticulata, antheram circa 

 medium amxam gerentia; styli 3, staminibus longioribus paullo 

 breviores. Capsulae maturae desiderantur. 



Western Hupeh: Hsing-shan Hsien, side of streams, alt. 1200- 

 1500 m., May 19, 1907 (No. 2885). 



