CHAP. XLII. 



ROSA CEM. SPIRJE^A. 



723 



to 1 franc each ; and at New York, from 25 cents to 50 cents each. Seeds of 

 one or two of the species may be procured, in London, at (id. per packet. 



§ i. Physocarpos Camb. 



Derivation. From phusa, a bladder, and karpos, a fruit; in reference to the bladdery carpels. 



Sect. Char. Ovaries connected at the base. Torus lining the calycine tube. 

 Carpels bladdery, rather membranous. Ovula 2 — 3, fixed to the semini- 

 ferous margin of the carpel, ovoid, at first horizontal, but at length sus- 

 pended. Flowers hermaphrodite, disposed in umbels. Pedicels 1-flowered. 

 Leaves toothed, or somewhat lobed, usually stipulate. {Don's Mill., ii. 

 p. 517.) 



1. S. OPULIFO^LIA L. 



The Guelder-Rose-leaved Spiraea, or Virginian 

 Guelder Rose. 



Dec. Prod., 2. 542. ; 



428 



Identification. Lin. Sp., 702.; Camb. Mon. ; Lois, in N. Du Ham., 6. p. 61. / 



Don's Mill., 2. p. 517. 

 Synonyme. Nine Bark, Amer. 

 Engravings. N. Du Ham., 6. t. 14. ; and our figs. 427, 428. 



Spec. Char., eye. Leaves lobed, or 3-lobed, and partaking of 

 an ovate figure, doubly serrated, petioled, and many of them 

 stipuled. Flowers white, nume- 

 i$S It rous, disposed in stalked hemisphe- 



rical corymbs ; the pedicel of each 

 flower slender and glabrous. Sepals 

 spreading. Torus wholly connate 

 with the tube of the calyx. Ovaries 

 connate with each other at the base. 

 Ovules in each 2 — 3, affixed to the 

 margin, egg-shaped, at first horizon- 

 tal, at length the one pendulous, the rest ascending. 

 Carpels bladdery, rather membranaceous, large and 

 diverging. Seeds obovate, glossy, and yellow. (Dec. 

 Prod., ii. p. 542.) A shrub, a native of North Ame- 

 rica, from Canada to Carolina ; found on the banks 

 of rivers, particularly among the mountains, where it is generally known by 

 the name of Nine Bark. It was introduced by Bishop Compton, in 1690; 

 and, in British gardens, grows to the height of 8 ft. or 10 ft., flowering in 

 June and July. It is hardy, and very ornamental, from its abundance of 

 white flowers, which are produced in corymbs, and resemble those of the 

 Guelder rose; and from the numerous inflated reddish capsules which 

 succeed the flowers. The leaves, which are lobed and veined, die off of 

 a purplish red mixed with yellow. In British nurseries, the plant is gene- 

 rally propagated by division of the root ; but sometimes by layers, or by 

 cuttings of the young wood put, in autumn, in a shady border, in a 

 sandy soil. 



Variety. 



3k S. o. 2 tomenUlla Ser. has the peduncles and calyx tomentose. (Dec. Prod., ii. p. 542.) It is 

 found at the Grand Rapids of the Columbia river. 



3fe 2. S. capitaVa Ph. The caphate-corymbed Spiraea. 



Identification. Ph. Fl. Amer. Sept., 1. p. 342. ; Camb. Monog. ; Dec. Prod., 2. p. 542. ; Don's Mill., 

 ii. p. 518. 



Synonyme. S. opulifblia var. Hook. 



Spec. Char., %c. Leaves ovate, doubly toothed, almost lobed ; beneath reticulate and tomentose. 

 Flowers disposed in terminal subcapitate corymbs placed on very long peduncles. Calyx tomen- 

 tose. Spontaneous in North America, on its eastern coast, and by the river Columbia. (Dec. 

 Prod., ii. p. 542.) According to Sweet's Hortus Britannicus, ed. 1830, p. 194., this was introduced 

 into Britain in 1827. It has white flowers, and has produced them here in June and July. We 

 have not seen the plant. 



si 3. S. mono'gyna Torrcy. The monogynous Spiraea. 



A shrub growing to the height of 3 ft. or 4 ft. on the Rocky Mountains. (Don's Mill., ii. p. 518.) No 

 yet introduced. 



3 c 3 



