38 WILSON EXPEDITION TO CHINA 
Hortensia mutabilis Schneevoogt, Icon. Pl. Rar. 36 t. (1793). 
Hortensia speciosa Targioni-Tozzetti in Ann. Imp. Mus. Firenze, I. Obs. Bot. 
36, t. 2 (1808). 
Hydrangea Hortensia Siebold in Nov. Act. Acad. Leop.-Carol. XIV. pt. ii, 688 
(Syn. Hydrang.) (1829). 
Hydrangea japonica, y Hortensia Regel in Gartenfl. XV. 290 (1866). 
Hydrangea Hortensia, £ Hortensia Maximowiez in Mém. Acad. Sci. St. Péters- 
bourg, sér. 7, X. No. XVI. 14 (1867). 
Hydrangea hortensis, var. Hortensia Rehder in Bailey Cycl. Am. Hort. II. 785 
(1900). 
Hupeh: A. Henry (No. 7385 with all the flowers sterile) Szech'uan: Nan- 
ch'uan, August 24, 1891, A. von Rosthorn (No. 602 with all the flowers sterile); 
Shi-tsu-kou, July 27, 1891, A. von Rosthorn (No. 75, without flowers). 
No. 7385 of Henry and No. 602 of Rosthorn represent the form with all the 
flowers sterile, like the well-known garden forms. As long as the form with fertile 
flowers has not been collected in a wild state in western China, its spontaneous 
occurrence must remain doubtful. So far no European collector has ever seen and 
collected it wild in these regions and the notes of the native collector who gathered 
the plants for A. von Rosthorn must be taken with some eaution. 
Subsect. 2. HETEROMALLAE Rehder, n. subsect. 
Piptopetalae Maximowiez in Mém. Acad. Sci. St. Pétersbourg, sér. 7, X. No. 
XVI. 8 (in part) (1867). 
This subsection is chiefly characterized by the partly superior ovary with 3-4 
styles and by the seeds with a wing on each end. The inflorescence is strongly 
convex with remote ramifications and sometimes paniculiform; the fertile flowers 
are white in the Chinese species and the petals drop before the opening of the 
anthers. The petioles do not exceed 5 em. in length. 
7. Hydrangea paniculata Siebold. See p. 25. 
8. Hydrangea hypoglauca Rehder. See p. 26. 
9. Hydrangea xanthoneura Diels. See p. 26. 
10. Hydrangea pubinervis Rehder. See p. 27. 
11. Hydrangea Bretschneideri Dippel, Handb. Laubholzk. III. 320 (1893). — 
Rehder in Mitt. Deutsch. Dendr. Ges. XII. 121 (1903). — Schneider, IU. Handb. 
Laubholzk. Y. 390, fig. 250 h-1, 251 a-b (1905). 
Hydrangea pubescens? Maximowicz in Mém. Acad. Sci. St. Pétersbourg, IX. 472 
(Ind. Fl. Pekin.) (nom. nudum, not Decaisne) (1859). — Koehne, Di 
Dendr. 189 (1893). 
Hydrangea vestita, var. pubescens Maximowiez in Mém. Acad. Sci. St. Péters- 
bourg, X. No. XVI. 10 (excl. synon. Decaisne) (1867). — Sargent in Gard. 
and For. III. 17, fig. 3 (1890). 
Hydrangea aspera Zabel in Gartenfl. XX XVIII. 461 (not Don) (1889). 
Hydrangea pekinensis Hort., synon. ex Dippel, l. c. 
Hydrangea vestita Hort., synon. ex Dippel, l. c. 
Chili: near Pekin (ex Maximowiez). In cultivation; originally raised from 
seed collected by Dr. Bretschneider near Pekin and sent to the Arnold Arboretum 
(Koehne, Herb. Dendr. No. 4070). d 
I do not see any reason to doubt the identity of Bretschneider's plant with the | 
H. . vestita, var. pubescens Maximowiez; the description of the latter agrees 
with the form cultivated in the Arnold Arboretum which shows a much dense 
pubescence than Koehne's No. 4070. The true H. heteromalla Don (H. 
Wallich) is easily distinguished by the dense white tomentum of the under side of 
the leaves and their fimbriately denticulate margin. 
