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PELARGONIUM acidum. 
Sour-leaved Stork's-hill. 
P. acidum, subacaule, radice tuberoso, foliis ovatis inte- 
gris trifidisve sinuatis dentatis glabris, stipulis petiolo 
adhaerentibus ovato-lanceolatis acuminatis subdentatis, 
umbellis multifloris, involucre polyphyllo, tubo necta- 
rifero calyce reflexo subtriplo longiore. 
Pelargonium acidum. Swt. hort. hrit.p. — . n. \7.inedit. 
Hoot tuberous, almost stemless, or stem very short. 
Leaves embracing each other at the base, ovate, some en- 
tire, others trifid, more or less sinuate and toothed, rather 
succulent, smooth and glossy, of a sour taste like Rumex 
acetosa, or sorrel; teeth rounded, bluntly mucronate. 
Petioles nearly cylindrical, or slightly flattened on the 
upper side, thickly clothed with short white down, and a 
few longer hairs intermixed, dilated at the base. Stipules 
large, joined to the base of the petioles, ovately lanceolate, 
taper-pointed, generally toothed. Scape long, not much 
branched, leafy, thickly clothed with soft white hairs. 
Peduncle long, cylindrical, villosely hairy. Involucre of 
numerous linear taper-pointed bractes. Pedicles Very 
short, scarcely any. Calyx 5-cleft, segments lanceolate, 
acute, all reflexed. Nectariferous tube nearly 3 times 
longer than the calyx, flattened and keeled on each side, 
a little gibbous at the base. Petals 5, spreading, of a 
dark velvet on a crimson ground : upper ones obovate, 
slightly emarginate, reticulately veined near the base ; 
lower ones spatulately ligulate, rounded. Filaments 10, 
united at the base, 7 of them bearing anthers, which in 
our specimen were all sterile ; one of the filaments a broad 
VOL. III. R 
