Sinm. | LXVIII, UMBELLIFERE (HIERN). 18 
12. SIUM, Linn.; Benth. et Hook. f. Gen. Plant. i. 893. 
Calyx-teeth obsolete; petals oval with an inflected acumen, midrib 
impressed, emarginate, connivent in bud; stamens exceeding the petals. 
Stylopods convex, thick, margin entire; style short and contiguous in 
flower, elongated and spreading in fruit. Fruit shortly ovoid, laterally 
compressed, subdidymous, contracted at the commissure when ripe ; 
mericarp somewhat pentagonal; primary ridges rather prominent, 
smooth, lateral ones near the commissure. Vittw oo. Carpophore 0. 
Seeds terete-pentagonal.—Glabrous herbs, growing in marshy or sub- 
aquatic places. Leaves pinnate, dentate; umbel regularly compound, 
tewmina and lateral, furnished with many-leaved involucre and in- 
volucels, 
A genus of a few species, found throughout the Northern hemisphere, and also in 
South Africa. 
1. S. Thunbergii, DC. Prod. iv. 125. Stoloniferous, 2-3 ft. high ; 
root fibrous; stem erect, striate, angular. Root-leaves a foot long, 
with petioles 5 in. long, dilated and sheathing at the base; sheath 
usually auricled or appendaged at apex, 2 in. long; leaflets varying 
in shape from ovate to oblong, sharply calloso-dentate, narrow and 
somewhat oblique at base, sessile, 14-3 in. long; stem-leaves similar 
but smaller. Fruiting umbels peduncled, of many slender rays, 1-2 in. 
long; secondary rays many, slender, }—2 in. long. Bracts of the 
involucre several, lanceolate-linear, acute, entire, 1-1} in. long; brac- 
jeole of the involucels similar, }-} in. long. Fruit glabrous, j, in. 
ng. 
Nile Land. Abyssinia, Ant. Petit. 
Occurs also in South Africa. 
Sium gallabatense, Schweinf. in Beitr. Fl. Zthiop. i. 273, is said to grow in Abys- 
suuia ; I have seen no specimen, and am not aware that it has been described. 
* 
13. PIMPINELLA, Linn.; Benth. et Hook. f. Gen. Plant. i. 893. 
Calyx-teeth obsolete; petals ovate or ovate-lanceolate, glabrous or 
minutely dentate, usually with an acute or blunt point, emarginate or 
entire, connivent in bud. Disk with thick stylopods, convex or coni- 
cal, margin entire; styles long or rather short, erect or spreading. 
Fruit glabrous, papillose or covered with straight or hooked hairs, 
laterally more or less compressed ; commissure wide; primary ridges 
equal ; secondary ridges absent. Vittw usually alternating with the 
primary ridges, 2 or more in the commissure of each mericarp, ©. 
Carpophore bifid or bipartite. Seed subterete or dorsally compressed. 
erbs annual, biennial or perennial. Leaves pinnate or decompound ; 
umbels regularly compound; bracts of the involucre 0 or 1-leaved or 
in P. simensis sometimes many-leaved, of the involucels 0 or of few 
leaves. Flowers white or slightly purplish.—G@ymnosciadium, Hochst. 
Flora 1844, 20. 
