SYNGENESIA. XECESSARIA. 185 



Species. I. G. stolonifei^a? Hippia stolonifera, Versoov., 

 2. p. 497- Hab. Coramonly difFused over the maritime 

 parts of South Carolina. S. Elliott, Esqr. Obs. Smooth; 

 stem repent; leaves setaceously pinnatifid; flowers sessile 

 to the root. 



A small genus of 3 species, 1 indigenous to the Cape of 

 Good Hope and another to India; the above is also com- 

 mon to Portugal. 



602. IVA. L. 



Calix about 5-leaved, or S-parted. Feminine 

 florets of the ray 5, naked. Receptacle setosely 

 paleaceousr Seed obovate, naked. 



Herbaceous or shrubby; leaves 3-nerved, mostly carne- 

 ous, opposite and alternate; flowers spiked or paniculated, 

 axillar and terminal. 



SVZCI-E.S. 1. I. ciliata. 2. * XanthifoUa. Annual; leaves 

 opposite, petiolate, cord ate -ovate, acuminated, doubly ser- 

 rate, softlv villous, beneath caiiescent; spikes paniculated, 

 naked; calix 5-cleft. Ka-b. In arid soils, near Fort Man- 

 dan, &c. on the banks of tiie Missouri. Obs. Plant very 

 large, 5 or 6 feet high, with leaves nearly of tiie size and 

 form of Xanthium Strumarhimy but covered with a soft 

 asid almost velvet-like villus; upper leaves ovate; flowers 

 extremely numerous, in a difrVise panicle. Calix 5-cleft, 

 divisions ovate-lanceolate, acuminate. Style of the discal 

 florets simple; stigma subcapitate. Fertile florets 5, na- 

 ked. Receptacle subsetaceous. — Flowering in August. 



3. imbficata, Calix imbricated; scales coriaceous, vviiite- 

 ish, 5 or 6. Feminine florets, apetalous, style long, 

 minutely sheathed at the base, liadical and younger- 

 leaves opposite and serrated; floral and upper stem leaves 

 alternate and entire. 



4. axillaris. Ph. Obs. Perennial and herbaceous; 6 to 

 12 inches high and smooth; leaves mostly opposite, cu- 



' neate-oblong, obtuse, 3-nerved, very entire, margin subci- 



Uate, scabrous; flowers axillary, solitary and nutant; vel- 

 lowish-green. Feminine florets, apetalous; receptacle 

 subse'osely ioliaceous. Style of the iliscal florets simple, 

 stigma subpeltate, fringed. Hab. In arid and saline soils 

 on the banks of the Missouri. Flowering in May. 5. fru- 

 tescens. Called Marsh-Elder. 



A North American genus with the exception of /. annua 

 indigenous to the tropical regioas of the same continent 



<t2 



