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, e Hortensia Maximowicz in Mem. Acad. Sci. St. PUers- 



bourg, b6t. 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, Uke 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 caution. 

 Subsect. 2. HETEROMALLAE Rehder, n. subsect. 

 Piptopetalae Maximowicz in Mem. Acad. Sci. St. Petersbourg, s6t. 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 cm. 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, III. Handb. 

 Laubholzk. 1. 390, fig. 250 h-1, 251 a-b (1905). 



Hydrangea pubescens? Maximowicz in Mem. Acad. Sci. St. Petersbourg, IX. 472 

 (Ind. Fl. Pekin.) (nom. nudum, not Decaisne) (1859). — Koehne, Deutsch. 

 Dendr. 189 (1893). 

 Hydrangea vestita, var. pubescens Maximowicz in Mem. Acad. Sci. St. Peters- 

 bourg, X. No. XVI. 10 (excl. synon. Decaisne) (1867). — Sargent in Gard. 

 and For. III. 17, fig. 3 (1S90). 

 Hydrangea aspera Zabel m Gartenfl. XXXVIII. 461 (not Don) (1889). 

 Hydrangea pekinensis Hort., synon. ex Dippel, I. c. 

 Hydrangea vestita Hort., synon. ex Dippel, I. c. 

 Chili: near Pekin (ex Maximowicz). In cultivation; originally raised from 

 seed collected by Dr. Bretschneider near Pekin and sent to the Arnold Arboretum 

 (Koehne, Herb. Dendr. No. 4070). 



I do not see any reason to doubt the identity of Bretschneider's plant with the 

 H. vestita, var. pubescens Maximowicz; the description of the latter agrees exactly 

 with the form cultivated in the Arnold Arboretum which shows a much denser 

 pubescence than Koehne's No. 4070. The true H. heteromalla Don (H. vestita 

 Wallich) is easily distinguished by the dense white tomentum of the under side of 

 the leaves and their fimbriately denticulate margin. 



