264 AMMIACEAE. 



volucels none. Calyx-teeth obsolete. Petals obtuse or 

 slightly retuse at the apex. Stylopodium long, conic. 

 Fruit linear-oblong, glabrous, terete or nearly so. Car- 

 pels half terete, dorsally flattened, prominently ribbed. 

 Oil-tubes solitary in the intervals. Seed-face flat or 

 slightly concave. 



1. F. foeniculum (L.) Karst. Perennial, branched, 7-20 dm. 

 high; leaves very finely dissected into capillary segments; petioles 

 broad, clasping; umbels large, 9-25-rayed; rays glaucous, 2.5-7.5 

 cm. long in fruit; pedicels 2-8 mm. long, slender; fruit about 6 mm. 

 long. {F. vulgare Gaertn.) 



In waste places and along streets. Native of Europe. 



18. SPHENOSCIADIUM Gray. 



Nearly simple thick-rooted perennials, with stout 

 stems glabrous up to the tomentose umbel, once or twice 

 pinnate leaves with bladdery dilated petioles, and scari- 

 ous white or purplish flowers sessile on an enlarged re- 

 ceptacle and forming a compact head. Calyx-teeth 

 obsolete. Fruit flattened dorsally, cuneate-obovate, hir- 

 sute. Carpel strongly flattened at base, winged above, 

 the dorsal and intermediate wings narrow, the lateral 

 broader. Stylopodium small and conic or flat in flower. 

 Oil-tubes solitary in the intervals, 2 on the commissural 

 side. Seed-face plane. 



1. S. capitellatum Gray. Very stout, 3-14 dm. high; leaves 

 large and glabrous; the leaflets oblong to linear-lanceolate, 2.5-5 

 cm. long, with rather few laciniate teeth or lobes, more or less 

 entire below; umbel equally 4-15-rayed, with globose umbellets of 

 sessile pubescent flowers; bractlets few, deciduous; rays 2.5-5 cm. 

 long; fruit cuneate-obovate, about 5 mm. long. 



Cienega, Davidson. 



19. COGSWELLIA Sprengel. 



Acaulescent or short caulescent dry-ground perennials, 

 with fusiform or tuberous roots, ternate, sometimes pin- 

 nate to dissected leaves, no involucre, and yellow, white 

 or purple flowers. Calyx-teeth usually obsolete. Fruit 

 strongly flattened dorsall}^ oblong to orbicular. Carpel 

 with filiform and approximate dorsal and intermediate 

 ribs, and winged laterals coherent until maturity with 

 those of the other carpel ; pericarp thin with strengthen- 

 ing cells beneath each rib. Stylopodium wanting. Oil- 

 tubes 1-several in the intervals, rarely obsolete, 2-10 on 



