140 : LXIII. UMBELLIFERS. 
10. SIUM, Linn. 
Calyx-margin 5-toothed or obsolete. Petals obcordate, with 
an inflexed point. Stylopod depressed or shortly conical. 
Fruit laterally compressed, subdidymous ; carpels with 5 fili- 
form, equal, obtuse ridges ; furrows and commissure both with 
many vittz ; carpophore 2-parted. Seed subterete.— FI. Cap. 
i. p. 539. : 
Mostly aquatic or marsh plants.—S. Thunbergi?, DC., our only species, 
has pinnate leaves, the leaflets ovate, acute, serrate, and stalked lateral 
or terminal umbels ; involucre and involucels many-leaved. Flowers white. 
Found in Western and Eastern districts and at Natal. 
11. RHYTICARPUS, Sond. 
Calyx-margin 5-toothed. Petals obovate, entire, involute, 
apex acute or acuminate. Fruit roundish, laterally compressed, 
crowned with the conical stylopod and short styles; carpels 
rugose, with 5 filiform ridges, the lateral marginal; furrows 
1-vittate ; commissure 2-vittate ; carpophore 2-parted. Seeds 
convex.— Fl. Cap. 1. p. 540. 
Glabrous perennials. Stem erect, glaucous; petioles 3-parted; leaves 
pinnatisect, lobes cuneate or subulate. Flowers yellow. Involucre and 
involucels many-leayed.—2 species. 
12. BUPLEURUM, Linn. 
Calyx-margin obsolete. Petals roundish, entire, with an 
involute, broad, obtuse point. Fruit laterally compressed or 
somewhat didymous, crowned with the depressed stylopod ; 
carpels with 5 acute, winged, filiform or obsolete ridges, the 
lateral marginal ; furrows with or without vitte, smooth or 
granulate.—F7. Cap. i. p. 541. 
Herbaceous or shrubby glabrous plants. Leaves usually quite entire.— 
2 Cape species: B. Mundti, a herb with linear-subulate, nerved leaves ; 
and B. difforme, a shrub with filiform, rush-like leaves. The former is 
Eastern, the latter dispersed. 
13. HETEROMORPHA, Ch. and Schl. 
Calyx-margin 5-toothed. Petals roundish, entire, involute, 
the apex broad, retuse. Fruit obovate-pyriform, 3-winged ; 
carpels unequal, of two forms, the outer one 2-winged, the 
inner one 3-winged, wings decurrent from the calyx-teeth ; 
furrows l-vittate ; commissure 2-vittate.— Fl. Cap. 11. p. 542. 
H. arborescens is a glabrous shrub, very variable in foliage. Leaves 
petioled, ovate or oblong, either quite entire, or 3-lobed, 3-parted or 8-folio- 
late. Umbels many-rayed. Inyolucels many-leaved. Flowers yellow.— 
Eastern district and Natal. 
