SAXIFRAGACEAE. HYDRANGEA 25 



HYDRANGEA L. 



Determined by ALFRED REHDER. 



Hydrangea umbellata Rehder, n. sp. 



Frutex metralis v. paullo altior ramulis fusco-purpureis, novellis 

 crispule pubescentibus, annotinis cortice laevi sine lenticellis, demum 

 in lamellas tenues solubili. Folia membranacea, oblongo-lanceolata 

 v. obovata, acuminata, basi cuneata, 5-9 cm. longa et 2-3 cm. lata, 

 denticulato-serrata basi excepta, supra luteoviridia, glabra costa 

 sparse villosa excepta, subtus glaucescentia, sparse ad venas densius 

 strigillosa et in axillis venarum barbata; petioli crispule pubescentes, 

 6-13 mm. longi. Inflorescentia umbelliformis multiflora, in apice 

 ramulorum sessilis, crispe pubescens, plerumque 5-radiata, pedicellis 

 circa 5 mm. longis; flores fertiles desunt; flores radiantes steriles 

 graciliter pedicellati, persistentes, 4-sepali sepalis late ellipticis v. sub- 

 rotundatis, crassiusculis, plus minus dentatis, 2-2.5 cm. longis et in- 

 terdum ad 2.5 cm. latis. Capsula (immatura) semisupera, cum stylis 

 6 mm. longa, parte superiore libera paullo longiore quam tubus calycis 

 pilis crispulis sparsis adspersi; styli 3, partem liberam capsulae sub- 

 aequantes, sat graciles; semina late elliptica, exalata. 



Kiangsi: Kuling, thickets, common, alt. 1200 m., July 29, 1907 

 (No. 1605). 



Closely related to H. scandens De Candolle (H. virens Siebold), which differs 

 chiefly in its smaller sparingly toothed leaves, in the few-flowered cymes with the 

 sterile flowers with three deciduous entire sepals, in the smaller capsules with 

 longer styles and in its lax habit with very slender often drooping branches. 



Hydrangea Davidii Franchet in Nouv. Arch. Mus. Paris, se"r. 2, 

 VIII. 227 (PL David. II. 44) (1885). 



Western Szech'uan: Mupin, thickets, alt. 1800-2250 m., June 

 and October 1908 (No. 1159), alt. 2400-2700 m., October 1910 (No. 

 4343); alt. 1500-1800 m., Nov. 1908 (No. 1249); Wa-shan, thickets, 

 alt. 1500-2100 m., June and November 1908 (No. 1159); without 

 locality, alt. 1500-2400 m., July 1903 (Veitch Exped. No. 3563). 



Wilson's specimens differ from Franchet's description slightly in having usually 

 4 sepals and in the leaves being up to 6 cm. broad. The capsule, which is not 

 described by Franchet, is subglobose, 2-3 mm. in diameter, the free part longer 

 than the tube of the calyx; the seeds are broadly elliptic, wingless, scarcely 1 mm. 

 long and light yellowish brown. 



Hydrangea paniculata Siebold in Nov. Act. Acad. Leop. Carol. XIV. 

 pt. ii. 690 (Syn. Hydrang.) (1829). 



