Refugium Botanicum.) (August, 1868. 
TAB. 28. 
Natural Order GERANIACE. 
Tribe PELARGONIES. 
Genus Prenarconium, L’ Herit. 
Sect. Orrpra. Radice crasso furcato, caulibus erectis, crassis, nodosis, 
foliis pinnatis vel bipinnatis, floribus parvis, petalis superioribus 
auriculatis. 
P. sisoNIFOLIUM, n. sp. Caulibus paullulum pubescentibus, foliis longe 
petiolatis breviter pubescentibus oblongis lyrato-pinnatis segmentis 
subrhomboideis contiguis late foliaceis inciso-dentatis, umbellis 4—6 
floris, pedicellis perbrevibus, calycis segmentis oblongo-lanceolatis 
albo-marginatis, petalis albis introrsum rubro-venosis superioribus 
ligulato-spathulatis calyce excedentibus, inferioribus minoribus calyce 
subsequalibus. 
Imported from the Cape by Mr. Cooper. 
Root thick, succulent, nodose, branched, the outer coat pale 
brown. Stem branching copiously from the crown of the root, the 
main branches a quarter to three-eighths of an inch thick at the 
base, pale green, finely and shortly gray-downy, swollen at the 
nodes, about a foot high when the plant is in flower. Stipules 
minute, thick, lanceolate. Petioles about an inch long when the 
plant is in flower, the lower ones finally two or three inches long, 
finely and shortly gray-downy like the stem. Leaves oblong in 
general outline, quite herbaceous in texture, pale green, finely 
downy, two or three inches long when the plant is in flower, by 
about an inch and a half broad, pinnate below, with rhomboidal 
deeply-toothed bluntish divisions, which are not more than half 
an inch broad at first, but afterwards enlarge considerably, the 
lower divisions cuneate at the base, the lower pair often a dis- 
tance apart from the rest, the central divisions forming a decur- 
rent wing to the petiole, those of the upper third of the leaf not 
reaching down to it. Flowers in copious close wmbels of four to 
six flowers each, on terminal peduncles, which are cernuous at 
first, but by the time the flowers open become erect and are three 
or four inches long. SBracts small, inconspicuous. Pedicels very 
short, a little downy, like the calyx, the divisions of which are 
oblong-lanceolate, about a quarter of an inch long, bluntish or 
subacute, bordered with white. Petals pure white, with a few 
