258 AMMIACEAE. 



sessile in dense bracteate heads. The outer bracts form 

 the involucre, the inner bractlets intermixed with the 

 flowers represent the involucels. Sepals prominent, 

 rigid, persistent. Fruit ovoid, flattened laterally, cov- 

 ered with hyaline scales or tubercles. Carpels with ribs 

 obsolete. Stylopodium wanting; styles short or long, 

 often rigid. Oil-tubes mostly 5, 3 dorsal and 2 commis- 

 sural. Seed-face plane. 



1. E. parishii C. & R. Stems slender, much branched, erect or 

 spreading, 1-4 dm. long; basal leaves simple or pinnate, the blades 

 or segments laciniate-toothed or cleft, tapering into a long more 

 or less spinosely toothed petiole; inflorescence beginning near the 

 base, diffusely branching; the heads on very short peduncles, nearly 

 globose, about 6 mm. long; bracts very narrow, rigid, 12-18 mm. 

 long, with a few spinose bristles at the base, not at all scarious- 

 margined; bractlets about the size of the bracts, short, scarious- 

 margined below, broadening upward to a short lobe on each side, 

 the margined base inclosing the fruit and falling with it; sepals 

 ovate, scarious-margined, 1.5 mm. long, tapering to a cuspidate bristly 

 tip; styles longer than the sepals. 



In low heavy ground toward the coast. First collected by 

 Parish near Oceanside. 



5. OSMORHIZA Raf. 



Glabrous or hirsute perennials from thick aromatic 

 roots, with ternately decompound leaves and white or 

 purple flowers in few-fruited umbels. Calyx-teeth obso- 

 lete. Fruit linear to linear-oblong, more or less attenu- 

 ate at base, acute or beaked at apex, glabrous or bristly 

 on the ribs. Carpels slightly or not at all flattened 

 dorsally. Stylopodium conic, sometimes depressed. Oil- 

 tubes obsolete in mature fruit, often numerous in young 

 fruit. Seed-face from slightly concave to deeply sulcate. 



1. O. brachypoda Torr. Stems rather stout, 3-9 dm. high, 

 pubescent or sometimes glabrous; leaves ternately compound; leaf- 

 lets 2-3 cm. long, acute, laciniately lobed or toothed; umbel 1-6- 

 rayed; involucre and involucels of linear bracts, the latter equaling 

 or exceeding the flowers; rays 3.5-10 cm. long; pedicels 1-2 mm. 

 long; fruit 12-16 mm. long, 4 mm. wide, short-attenuate at base, 

 rough-bristly on the very prominent ribs; stylopodium and style 3 

 mm. long; the former broad and somewhat depressed; seed-face very 

 concave, nearly inclosing a central cavity. 



Occasional in all the mountains on shady slopes. 



6. CAUCALIS L. 

 Mostly hispid annuals with pinnately dissected leaves 

 and white flowers. Calyx-teeth prominent. Fruit ovate 



