Lo) | 
ROSACEA. 19 
Trine .—SPIRAIDA. 
Shrubs or herbs, with simple or interruptedly pinnate leaves. 
Calyx widely bell-shaped. Petals white. Stamens indefinite. Carpels 
in a single whorl, generally 5, but sometimes reduced to 1 or 2. 
Fruit consisting of follicles, dehiscent on the inner suture, or 
splitting into 2 valves. Styles terminal. Seeds 2 to 6 (more rarely 
1 to 10) in each carpel. 
GENUS I1T—SPIRAA. Linn. 
Flowers perfect or sometimes polygamous. Calyx-tube concave 
or bell-shaped, 5-cleft, persistent, the segments separate in eestiva- 
tion, without an epicalyx. Petals 5, obovate or roundish, with 
short claws inserted in the throat of the calyx, spreading. Stamens 
10 to 20, more rarely 30 to 60, exserted. Carpels 5, more rarely 
3 to 12, free, sessile or shortly stipitate. Fruit of as many follicles 
as there are carpels. 
Shrubs with simple, entire, serrate, or lobed leaves, with or 
without stipules; or herbs with interruptedly-pinnate or palmate 
leaves with stipules; or herbs with tripinnate leaves and no 
stipules. 
The derivation of the generic name of these plants is said to be from speira, a cord, 
in reference to the flexibility of the branches of some of the species, or from the Greek 
omepaw (speirao), I become spiral, or wreath, in allusion to the fitness of the plants to 
be twisted into garlands. 
Section I.—EU-SPIRMA. Torrey & Gray. 
Shrubs with entire or serrate shortly stalked exstipulate leaves. 
Flowers perfect, in corymbs or panicles. Ovaries free at the base, 
containing numerous ovules. Ovules pendulous. Disk combined 
with the tube of the calyx, free at the margin, mostly crenate, 
with glandular teeth or lobes. Follicles not inflated. Seeds gene- 
rally with a loose membranous testa, attenuate at each end. 
SPECIES I—SPIRMA SALICIFOLIA. Linn. 
Pruate CCCCXIV. 
A bushy shrub, producing numerous suckers. Leaves shortly- 
stalked, elliptical or lanceolate-elliptical, sharply serrate at the 
margins, glabrous beneath, without stipules. Flowers in dense 
terminal panicles, which have the branches short and with the 
