SAXIFRAGACEAE. — HYDRANGEA 37 



ENUMERATION OF THE SPECIES. 



Sect. I. EUHYDRANGEA Maximowicz in Mem. Acad. Sci. St. PUershourg, 

 64r. 7, X. No. XVI. 7 (1867). 



Subsect. 1. PETALANTHAE Maximowicz, I. c. 



This subsection is taken here in a wider sense than in its original conception 

 and includes all the species with a wingless or nearly wingless seed. The ovary 

 is partly superior with 3-4 styles and the cymes are usually flat; the petals 

 are spreading or reflexed and usually persistent during anthesis. Petioles 1-3, rarely 

 5 cm. long. 



1. Hydrangea chinensis Maximowicz, I. c. (1867) — Hemsley in Jour. Linn. Soc. 

 XXIII. 273 (1887). 



Fokien: April- June 1905, S. T. Dunn (No. 2664). Formosa: Tamsuy, 1864, 

 R. Oldham; Bankinsing, A. Henry (Nos. 98, 590, 1716). 



2. Hydrangea umbellata Rehder. See p. 25. 



3. Hydrangea Davidii Franch. See p. 25. 



4. Hydrangea yunnanensis Rehder, n. sp. 



Frutex metraUs v. ultra ramulis hornotinis dense strigilloso-villosulis, annotinis 

 flavescentibus. Folia membranacea, oblonga v. oblongo-lanceolata, acuminata, 

 basi cuneata, dentata v. denticulata basi excepta, 7-12 cm. longa et 2.5-4 cm. 

 lata, supra luteo-viridia, sparse setulosa v. glabrescentia, ad costam dense strigil- 

 loso-villosa, subtus pallida, costa venisque setulosis exceptis glabrescentia v. in- 

 terdum parce setulosa, utrinsecus 10-14-costata; petioli crispulo-villosi, circa 1 cm. 

 longi. Cyma fere plana v. convexa, radiis 5-7 oppositis remotis composita, strigi- 

 loso-villosa ; flores steriles 3-4 cm. diam., sepalis 3-4, late ovatis albis plerumque 

 paucidentatis v. denticulatis; flores fertiles cyanei pedicellis plerumque receptaculo 

 brevioribus; calycis dentes triangulari-ovati; petala obovato-oblonga, staminibus 

 longioribus subaequilonga, circa 3 mm. longa; styU 3. Capsula ovoidea stylis 

 persistentibus inclusis 4-5 mm. longa, pars libera fere duplo longior quam tubus 

 calycis; styli apice valde recurvati stigmatibus fere circulum formantes; semina 

 late elliptica, exalata. 



Yunnan: Mengtze, mountain forests to the north, alt. 2100 m., A. Henry (Nos. 

 10236, 10236 B). 



Closely related to H. Davidii Franch. which is easily distinguished by its linear- 

 lanceolate sepals, lanceolate petals, longer and slenderer pedicels, suborbicular 

 capsules and straight styles only slightly curved at the apex. 



5. Hydrangea Moellendorfii Hance in Jour. Bot. XII. 177 (1874). 

 Kiangsi: near Iviukiang (ex Hance). 



I have seen no specimen of this species, but as Hance states that it is closely 

 related to H. hirta I assume that the inflorescence is peduncled and leafless as in 

 that species. 



6. Hydrangea opuloides K. Koch, Dendr. I. 353 (1869). 



Hydrangea japonica Siebold in Nov. Act. Acad- Leop.-Carol. XIV. pt. ii. 689 



{Syn. Hydrang.) (1829). 

 Hydrangea opuloides, var. Hortensia Dippel, Handb. Laubholzk. III. 322 (1893). 

 Hortensia opuloides Lsi.mavck, Encycl. III. 136 (1789). — Jacquin, Fragm. Bot. 



7, t. 3 (1800). 

 Hortensia japonica Gmelin, Syst. II. 722 (1791). — Zorn, Auswahl Schon. Gew. 



III. 58, t. 149 (1796). 

 Hydrangea hortensis Smith, Icon. Pict. t. 12 (1792). — Sims in Bot. Mag. XIII. 



t. 438 (1799). — Savi, Fl. Ital. III. 65, t. 110 (1824). 



