262 UMBELLIFER.E. crantzia. 



ERYNGIUM. 



jection smaller. California and Nevada. 



Var. Leifoergi C. & R'. Rev. Umb. 92. Tall and slender, a foot or 

 more high, with petioles correspondingly elongated. Sand hills in the 

 Bitterroot Mts., Idaho. 



18 CRANTZIA Nutt. Gen. i, 178. 



Small glabrous perennial herbs, creeping and rooting in the 

 mud, with leaves reduced to hollow cylindrical or awl-shaped 

 petioles, jointed by transverse partitions, minute involucral 

 bracts, and simple few-flowered umbels of white flowers. Calyx- 

 lobes small. Fruit globose, slightly flattened laterally, glabrous. 

 Carpel with filiform dorsal and intermediate ribs; laterals very 

 thick and corky next the commissure. Oil-tubes 2 on the com- 

 missure. Seed terete. 



C. liniata Nutt 1. c. Leaves very obtuse, 1-3 inches long, 1-2 lines 

 broad: fruit a line long, the thick lateral wings forming a corky margin. 

 In salt marshes, Vancouver Island to Oregon and the Atlantic Coast. 



19 (ENANTHE L. Gen. n. 352. 



Mostly aquatic glabrous herbs, with succulent stems, pinnate 

 or decompound leaves, and usually involucrate umbels of white 

 flowers. Calyx -lobes rather prominent. Fruit globose, slightly 

 flattened laterally if at all, glabrous. Carpel with broad obtuse 

 corky ribs : laterals the largest. Stylopodium-very short-coni- 

 cal. Oil-tubes 2 on the commissure. Seed sulcate beneath each 

 oil-tube. 



(E. sarmentosa Presl. D C. Prod, iv, 138 Stems 2-5 feet high, leaves 

 ternate and bipinnate; leaflets ovate, acuminate, toothed often lobed at 

 base, 6-12 lines long : umbels many-rayed, with involucre of few linear 

 bracts or none, and involucels of similar more numerous bractlets : rays an 

 inch long or less; pedicels short: fruit about 2 lines long, with commis- 

 sural face and ribs very corky. In marshes, Alaska to California. 



* * * Fruit flattened laterally. 



-*■ Prickly, or with tuberculate scales. 



20 ERYNGIUM Tourn. L. Gen. n. 324. 



Glabrous perennials with mostly rigid, coriaceous, spinosely 

 toothed or divided leaves and white or blue flowers, in dense ses- 

 sile bracteate heads, the outer bracts form the involucre, the 

 inner ones, bractless, intermixed with the flowers represent the in- 

 volucels. Calyx-lobes very prominent, rigid and persistent. 

 Fruit ovoid, crowded with hyaline scales or tubercles. Carpel 

 with ribs obsolete. Stylopodium wanting: styles short or long, 

 often rigid. Oil-tubes mostly ft on the back and 2 on the com- 

 missure. Seed-face plane. 



E. Vaseyi C. & R. Bot. Gaz. xiii, 142. Stems from a few inches to a 

 foot Ijigh, several from a common root and branching above: leaves ob 

 lanceolate, unequally spinulose-serrate, attenuate below: involucre of nar- 

 row thick and rigid spinose and spiny-toothed bracts, much longer than 



