UMBELLIFEK^E. ( PARSLEY FAMILY.) 211 



* Pericarp thin except at the broad corky dorsal and lateral ribs; leaves round- 

 peltate, crenate ; peduncles as long as the petioles, from creeping rootstocks. 



*- Fruit notched at base and apex; intermediate ribs cork//. 



1. H. umbellata, L. Umbels many-flowered, simple (sometimes pro- 

 liferous) ; pedicels 2-6" long ; fruit about 1-J" broad, stronglv notched, the 

 dorsal ribs prominent but obtuse. Mass, to Minn., south to the Gulf. 



2. H. Canbyi, Coult. & Rose. Umbels 3 - 9-Jloircred, generally proliferous ; 

 pedicels very short, but distinct; fruit about 2 lines broad ; carpels broader and 

 more flattened than in the preceding, sharper margined, the dorsal and lateral 

 ribs much more prominent; seed-section much narrower. (H. umbellata, var.? 

 ambigua, Gray, Manual). N. J. to Md. 



-t -t~ Fruit not notched ; intermediate ribs not corky. 



3. H. verticillata, Tlmub. Umbels few-flowered, proliferous, forming 

 an interrupted spike; pedicels very short or none; fruit l-J-2" broad; dorsal 

 and lateral ribs very prominent. (H. interrupta, ]\Fnhl.) Mass, to Fla. 



* * Pericarp uniformly corky-thickened and ribs all filiform ; leaves not peltate ; 



peduncles much shorter than the. petioles. 



- Fruit small, without secondary ribs or reticulations ; involucre small or none. 



4. H. Americana, L. Stems filiform, branching and creeping ; leaves 

 thin, round-reniform, crenate-lobed and the lobes crenate, shining ; few-flowered 

 umbels axillary and almost sessile ; fruit less than 1" broad; intermediate ribs 

 prominent; no oil-bearing layer; seed-section broadly oval. Common. 



5. H. ranunculoid.es, L. f. Usually floating ; leaves thicker, round-reni- 

 form, 3 - 7-cleft, the lobes crenate; peduncles 1 -3' /on//, reflexed in fruit; capi- 

 tate umbel 5- 10-flowered ; fruit 1-H" broad; ribs rather obscure ; seed-sec- 

 tion oblong. E. Psnn. to Fla., thence westward. 



*- -i- Fruit larger (2-2-^" broad), with prominent secondary ribs and reticula- 

 tions; the 2-4-J1owered umbel subtended b;/ two conspicuous bracts. 



6. H. Asiatica, L. Petioles and peduncles (1 - 2' long) clustered oil 

 creeping stems or runners ; leaves ovate-cordate, repand-toothed, thickish ; 

 seed-section narrowly oblong. (H. repanda, Pers.) Md. to Fla. and Tex. 

 (Widely distributed in the tropics and southern hemisphere.) 



35. ERYNGIUM, Tonrn. ERYNGO. 



Calyx-teeth prominent, rigid and persistent. Styles slender. Fruit ovate 

 or obovate, covered with little hyaline scales or tubercles, with no ribs, and 

 usually 5 slender oil-cubes on each carpel. Chiefly perennials, with coriaceous, 

 toothed, cut, or prickly leaves, and blue or white bracted flowers closely sessile 

 in dense heads. (A name used by Dioscorides, of uncertain origin.) 

 * Stout, icith parallel-veined elongated linear thick leaves. 



1. E. yuccsefdlium, Michx. (RATTLESNAKE-MASTER. BUTTOX SNAKE- 

 ROOT.) Branching above, 1-6 high ; leaves rigid, tapering to a point (lower 

 sometimes 2-3 long), the margins remotely bristly; heads ovate-globose (9" 

 long), with ovate-lanceolate mostly entire cuspidate-tipped bracts shorter than 

 the head, and similar bracelets. Dry or damp soil, X. J. to Minn., south to 

 Fla. and Tex. July - Sept. 



