Sium. | UMBELLIFER2 (Sond.) 539 
Herbs with radical, pinnatifid leaves, the segments roundish, dentate or cut, 
rarely entire ; cauline leaves more finely divided. Involucres wanting. Flowers 
white or yellow. Name from bipinnata, twice pinnate ; the leaves are often so, 
ANALYSIS OF THE 8. AFRICAN SPECIES. 
Radical leaves bi-pinnatisect ... 00. 0s. ee eee seer (4) Stadensis, 
Radical leaves cordate-suborbicular, inciso-serrate ... ... -.. (2) Caffra. 
1. P. Stadensis (Harv. gen. 135.) erect, branched, glabrous, but mi- 
nutely downy above the middle ; leaves bipinnatisect, lobes pinnatifid and 
trifid ; segments sublinear, cuspidate, spreading ; upper leaves pinnati- 
fid or trifid or nearly entire ; the radical ones long petiolated ; involu- 
crum wanting ; involucels 1-2 leaved or wanting ; rays and pedicels 
as well as the ovary pubescent; fruit, when ripe, broadly ovate, hairy or 
subglabrous. Anisum Stadense, HL. & Z.! 2199. 
Has. Among shrubs in the Vanstadens mountains, Uitenhage, Z. dé Z/ Feb. 
(Herb. Sd.) . 
Habit of a small P. dissecta. Root seemingly biennial. Stem 1-1} foot, terete, 
striate. Radical leaves about 1 inch long, 3 inch wide, on a twice longer, subfili- 
form petiole, ; segments 1-2 lines long, the terminal often longer, nearly 1 line 
broad. Umbel with 6-8 uncial rays. Involucels capillary, shorter than the pedi- 
cels, Flowers’small, white. Fruit 1 line long, with short, conical stylopodium, 
and spreading, short styles. Mericarps with 5 prominent ribs. 
2. P. Caffra (Harv. 1. c.) erect, branched, minutely downy from the 
base ; radical leaves longish-petiolate, cordate-suborbicular, inciso-ser- 
rate; lower cauline leaves pinnately lobed, lobes linear-lanceolate or 
cuneate; uppermost leaves trifid or undivided linear ; involucrum and 
involucel wanting ; rays and pedicels pubescent, ovary glabrous or nearly 
so; fruit ovate-oblong. 
nearly the same, but the ovary and fruit quite glabrous or sometimes beset with a 
few hairs, ‘The stylopodium is depressed. Ripe mericarps are unknown. 
X. SIUM, Linn. 
Margin of the calyx 5-toothed or obsolete. Petals obcordate, with 
an inflexed point. Stylopodium depressed or shortly conical. Styles 
divaricated or recurved. Fruit laterally compressed or contracted, and 
subdidymous; mericarps with 5 filiform, equal, obtuse ridges; furrows 
and commissure with many vitte. Carpophore bipartite. Seed sub- 
terete. Koch. Umbell. 117. DC. 1. c. 124. | 
Mostly aquatic herbs. Leaves pinnate or pinnatifid. Umbels terminal, many- 
surrounded by many-leaved involucra. Flowers white. Name from siu, 
water, in Celtic; habitation of most of the species. 
1. S. (Berula) Thunbergii (DC.1.c. 125); root fibrous, stolonifer- 
ous ; stem erect, striated ; branches angular; leaves pinnate ; leaflets 
ovate, acute, regularly and callously serrated ; umbels unculate, 
lateral or terminal ; involucre and involucels many-leaved. 2. & 4./ 
2200, 8. angustifolium, Thunb.! Fl. Cap. 260. Herb. Un. Itin. n. 69. 
Zeyh. 2674. 
