MACLOSKIE: UMBELLIFER^E. 641 



13. AMMI Linn. 



Stout herbs, with striate stem and thrice-pinnatipartite leaves, and large 

 many-rayed compound umbels, with large, pinnatipartite involucral-leaves. 

 Calyx-teeth obsolete. Petals white, unequal, obcordate, radiant, their 

 apex notched and inflected. Fruit long, the mericarps at length slightly 

 curved, 5-angled. 



Species 6-7, Mediterr. region to the Azores. (Fig/in Eng. and Prantl, 



iii, 8. p. 190.) 



A. VIZNAGA (L.) Lam. 



Annual or biennial. Stem terete, glabrous. Leaves decompound, 

 their segments linear, cuspidate, divaricate. Rays of umbel at length 

 contracted and indurate. 



(Mediterr. lands to Madeira); N. Patagon., by Rio Negro. 



14. SIUM Linn. 



Marsh herbs, with pinnate stem-leaves ; the lower and the radical leaves 

 often pinnatisect. Flowers white, in large compound umbels. Bracts of 

 involucre and involucel numerous and narrow. Calyx-teeth visible. 

 Petals with inflected apex. Styles short. Fruit oval, subcompressed, 

 with prominent ribs, and 13 vittae in the intervals. 



Species 8, N. Temperate and S. Africa. 



(?) S. LATIFOLIUM Linn. 



Root creeping. Stem sulcate-angulate. Leaf-segments lanceolate- 

 acuminate, unequal at the base, serrate, rarely pinnatifid. Calyx-teeth long. 



(Eur., in swamps); N. Patagon., by Rio Negro, flowering but never 

 fruiting in this region. 



15. LIL^EOPSIS Greene. (Crantzia Nutt. 1819, non Scop. 1777.) 

 Small, creeping, glabrous marsh-herbs, with hollow, linear, terete leaves, 

 transversely nodose ; and simple umbels of white flowers, with minute 

 calyx-teeth, and petals apically infolded. Carpophore not developed. 

 Species i, viz: 



L. LINEATA Michx. 



Petioles linear-spatulate ; no leaf-blades. (Fig. 80.) 

 (N. and S. Amer.; also in Austral, and New Zeal.); Patagon., by Rio 

 Negro, and Rio Gallegos ; Magellan, at Gregory Bay ; S. Fuegia ; Falk- 



