144 NAT. ORDER. SPIR^ACE^. 



has an abundance of shoots, seldom six inches high, about the thick- 

 ness of the finger, wand-hke and branched ; the wood is britde ; the 

 bark of die shoots is a yellowish brown, with prominent dots scattered 

 over its surface ; the branches are alternate, commonly angular, with 

 a testaceous bark somewhat striated, and in the younger branches 

 covered with a tender ash-colored epidermis, which falls off; the an- 

 nual shoots are grooved and pubescent ; the leaves are alternate, soft, 

 pubescent, with prostrate hairs, quite entire at the base, but generally 

 deeply serrated from die middle to the end, where they are sharp ; 

 corymbs at the top of the stems frequent, many-flowered, terminating 

 the annual alternate shoots ; in gardens and in moist shady places 

 these corymbs are more elongated ; but in a ruder soil most of the 

 peduncles are clustered at the top, like an umbel ; the flowers are 

 large, white, having a weak virose smell, and fugacious. It is a na- 

 tive of Siberia. 



Spirma crenata. Hawthorn-leaved Spiraea. This species has 

 several stems, scarcely six inches high, very much branched from the 

 bottom ; the branches are rod-like, round, with a testaceous bark cloven 

 longitudinally ; the leaves on the younger branches and annual shoots 

 are alternate, attended with smaller ones in little bundles, hoary or 

 glaucous, three-nerved, hard, varying in form and size ; on the luxu- 

 riant shoots or branches sometimes ovate-acute, serulate from the dp 

 beyond the middle, but most commonly oblong, blundsh, crenulate, or 

 serrulate towards the tip, or sometimes quite endre ; the corymbs at 

 the ends of the annual shoots, very abundant, disposed along the 

 branches on one side, in hemispherical clusters ; the flowers are small, 

 white and odorous. It is a native of Spain, and flowers here in April 

 and May. 



Spircea trilobata. Three-lobed-leaved Spiraea. This species has 

 numerous stems, about the size of a large goose-quill, very much 

 branched, upright, with a gray bark, which is more or less pale, and 

 somewhat ang-ular, with sharo streaks running down from the 

 branches ; the branches and branchlets are alternate, those of the last 



