SAXIFRAGACEAE. — HYDRANGEA 39 



Hydrangea Bretschneideri, var. lancifolia Rehder. See p. 28. 



Hydrangea Bretschneideri, var. Giraldii Rehder, n. var. 



Hydrangea Giraldii Dials in Bot. Jahrb. XXIX. 373 (1900). 

 I am not able to separate H. Giraldii specifically from H. Bretschneideri; it seems 

 to differ only in narrower leaves gradually narrowed into the petiole and in the paler 

 color of the bark. In the shape of the leaves it resembles H. xanthoneura, var. 

 Wilsonii Rehd. which is easily distinguished by the leaves being glabrous or nearly 

 so beneath. 



Northern Shensi: T'ai-pa-shan, December 1893, G. Giraldi (No. 1169! No. 

 1172 ex Diels); Huan-tou-shan, Ki-shan, G. Giraldi (No. 1167, 1171 ex Diels); 

 Tue-lian-pin, G. Giraldi (No. 1168). 



12. Hydrangea mandarinoriim Diels in Bot. Jahrb. XXIX. 372 (1900). 

 Szech'uan: Nanch'uan, A. von Rosthorn (No. 1932 in Herb. Christiania). 

 Diels places this species in the section Petalanthae, but it does not differ in the 



structure of its flowers from H. heteromalla Don and its allies. 



Subsect. 3. ASPERAE Rehder, n. subsect. 



Piptopetalae Maximowicz in Mem. Acad. Sci. St. Petersbourg, X. No. XVI. 8 

 (in part) (1867). 

 This subsection is chiefly characterized by the inferior ovary developing into a 

 hemispheric or turbinate capsule truncate at the apex. The seeds have a wing 

 on each end; the styles are usually 2; the petals fall off before the stamens are fully 

 developed, sometimes as a whole by cohering at the apex. The petioles sometimes 

 attain 20 cm. in length. 



13. Hydrangea Sargentiana Rehder. See p. 29. 



14. Hydrangea longifolia Hayata in Jour. Coll. Sci. Tokyo, XXV. 91 {Fl. Mont. 

 Formos.) (1908). 



Formosa: Taitou, Torokusha, T. Kawakami & G. Nakahara (No. 690, ex Hayata) . 



15. Hydrangea Kawakamii Hayata, I. c. 90, t. 8 (1908). 



Formosa: Mt. Morrison, alt. 2300 m., T. Kawakami &-U . Mori (No. 1875, 

 ex Hayata). 



16. Hydrangea villosa Rehder. See p. 29. 

 Hydrangea villosa, var. strigosior Rehder, n. comb. 



Hydrangea aspera, var. strigosior Diels in Bot. Jahrb. XXIX. 375 (1900). 



Szech'uan: Tsaku-lao, Wei-kuan, August 20, 1891, A. von Rosthorn (No. 2546). 

 Hupeh: A. Henry (No. 2473); August 1901, E. H. Wilson (Veitch Exped. No. 

 1473^, with sterile flowers). 



Differs from the type by its less villous tomentum. Branchlets usually only 

 appressed strigose with fulvous hairs at the nodes; petioles hirsute with fulvous 

 hairs interspersed; leaves hirsute- villose beneath, the hairs on the veins scarcely 

 longer and not fulvous. 



17. Hydrangea fulvescens Rehder, n. sp. 



Frutex circa 1 m. altus ramulis junioribus parce strigosis pilis patentibus 

 rufescentibus intermixtis, vetustioribus griseo-brunneis peridermate solubili. 

 Folia membranacea, ovata v. ovato-oblonga, acuminata, basi rotundata v. sub- 

 cordata, irregulariter serrata serraturis triangularibus acuminatis plerumque 

 curvatis, 9-13 cm. longa et 4.5-8.5 cm. lata, supra flavo-viridia, strigosa, in costa 

 venisque densius strigosa, subtus pallidiora dense hirtello-strigosa in costa media 

 venisque pilis longis hirtis fulvis praedita, utrinsecus 7-9-costata; petioli graciles, 

 pilis hirtis et interdum strigosis obsiti, 3-9 cm. longi. Cyma plerumque 5-radiata, 

 laxa, strigosa pilis patentibus fulvis interspersis; flores radiantes albi sepalis 4 



