UMBELLIFER^. (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 corkij. 



1. H. Umbellata, L. Umbels mamj-flowered, simple (sometimes pro- 

 liferous) ; pedicels 2-6'' long; fruit about l^" broad, strongly uotched, the 

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



2. H. Canbyi, Coult. & Rose. Umbels 3 - 9-fowered, general! >/ 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. 



-«- -(- Fruit not notched ; intermediate ribs not corky. 



3. H. Verticillata, Thunb. Umbels few-flowered, proliferous, forming 

 an interrupted spike; pedicels very short or none; fruit 1^-2" broad; dorsal 

 and lateral ribs very prominent. (H. interrupta, Muhl.) — Mass. to Fla. 



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



peduncles much shorter than the petioles. 

 •t- Fruit small, u'ithout secondary ribs or reticulations ; involucre small or none. 



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

 thin,Tound-ven'doTm,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. ranunculoldes, L. f. Usually footing ; leaves thicker, round-reni- 

 form, 3 - 7-cleft, the lobes crenate ; peduncles 1-3' long, refiexed in fruit ; capi- 

 tate umbel 5 - 1 0-flowered ; fruit l-H" broad; ribs rather obscure ; seed-sec- 

 tion oblong. — E. Penn. to Fla., thence westward. 



♦- -1- Fruit larger (2-2^" broad), with prominent secondary ribs and reticula- 

 tions ; the 2-4flowered umbel subtended by two conspicuous bracts. 



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

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

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

 (Widely distril)uted in the tropics and southern hemisphere.) 



35. ERYNGIUM, Tourn. Eryxgo. 



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-tubes 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, with parallel-veined elongated linear thick leaves, 



1. E. yuec8ef61ium, Michx. (Rattlesxake-Master. Button 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 bractlets. — Dry or damp soil, X. J. to Minn., south tu 

 Fla. and Tex. July -Sept. 

 10 ' 



