ROSACEAE. — ROSA 345 



1. Prinsepia utUis Royle, III Bot. Himal. 206, t. 38, fig. 1 (1839). — Brandis, 

 Forest Fl. Bnt. Ind. 196 (1874); Ind. Trees, 281 (1906). — Hooker f., Fl. Brit. 

 Ind. 11. 323 (1879). — Franchet, PL Delavay. 198 (1890). — Collett, Fl. Siml. 156 

 (1902). — Schneider, III. Handh. Laubholzk. I. 651 (1906). — Hayata in Jour. 

 Coll. Sci. Tokyo, XXX. art. 1, 105 (Mat. Fl. Formosa) (1911); Icon. PL Formes. 

 I. 219 (1911). — Diels in NoL Bot. Gard. Edivhurgh, VII. 15, 286 (1912). 



Yunnan: Mengtsze, A. Henry (Nos. g281, 11343) : Tali valley, alt. 2000-2400 

 m., G. Forrest (Nos. 146, 4974). Formosa (ex Hayata). East Himalaya. 

 The Fonnosan plant is possibly a distinct variety or species. 



Sect. 2. PLAGIOSPERMUM Rehder, n. sect. 



Plagiospermum, Oliver in Hooker's Icon. XVI. t. 1526 (1886). 



Flores fasciculati; stamina 10, bi-serialia. Frutices ramis cinereis spinis vix 1 cm. 

 excedentibus aphyllis munitis. 



2. Prinsepia sinensis Oliver ms. apud Bean in Kew Bull. Misc. Inform. 1909, 

 354. — Bean, Trees & Shrubs BriL IsL I. 223, fig. (1914). 



Plagiospermum sinense Oliver in Hooker^s Icon. XVI. t. 1526 (1886). — A. 

 Purpus in Mitt. Deutsch. Dendr. Ges. XII. 1, t. (1903). — Komarov in Act. 

 Hort. Petrop. XXII. 554, t. 12 (FL Mansh.) (1904). — De Wildeman, 

 Icon. HorL Then. V. 89, t. 182 (1905). 



Mandshuria (ex Oliver et ex Komarov). 



I know this species only from cultivated plants. It has been growing at the 

 Arnold Arboretum since 1903 and flowers profusely every year, but fruits very 

 rarely and sparingly. The fruits, which ripen in August, are ovoid, about 1.5 cm. 

 long and deep red when fully ripe. 



3. Prmsepia uniflora Batalinm ^ci. Hort Petrop. XII. 167 (1892); in Gartenfl. 

 XLII. 331 (1892). 



Northern Shensi: Yenan Fu, 1910, W. Purdom (No. 324; bush 1-1.25 m.). 



As the flowers of this species have not yet been described, their description from 

 the specimens collected by Purdom and from Uving plants cultivated at the Arnold 

 Arboretum may follow here: Flowers white, 1.5 cm. in diam., 1-3 together with 

 fascicled leaves from axillary buds on last year's branches; pedicels glabrous, 3-5 

 mm. long, calyx-tube broadly turbinate, sepals seraiorbicular, reflexed, ciUate, 1.5 

 mm. long; petals obovate, broadly cuneate at the base, scarcely clawed, 5-6 mm. 

 long; stamens 10, with very short compressed filaments finally incurved, about 

 0.75 mm. long, slightly longer than the orbicular-ovate yellow anthers; style lateral, 

 curved, not exceeding the calyx-tube, with a large oblique capitate stigma. On 

 vigorous shoots of young plants the leaves attain 6 cm. in length, but do not 

 exceed 7 or 8 mm. in width; the margins are distinctly serrate, but the upper third 

 of the leaves is usually quite entire; they are of firm, chartaceous texture, and dark 

 green and somewhat lustrous above, and lighter below. Prinsepia unijlora Batalin 

 is closely related to P. sinensis Oliver, but is easily distinguished by the much nar- 

 rower subchartaceous sometimes serrulate leaves and by the short-stalked white 

 flowers. 



The plant was raised in the Arnold Arboretum in 1911 from seeds collected by 

 Purdom in Shensi and flowered for the first time in 1914; in 1915 it produced 

 fruits. 



