UMBELLIFERAE (PARSLEY FAMILY) 609 



* * * * Fruit strongly flattened dorsally, the lateral ribs prominently winged. 

 +- Acaulescent or nearly so, with filiform dorsal ribs, thin coherent wings, and no stylopodium. 

 84. Lomatium. Fruit orbicular to oblong, oil-tubes 1-4 in the intervals, 2-6 on the commissure. 

 (- +- Caulescent branching plants, with depressed stylopodium and yellow petals (these unknown 



in no. 85). 

 H- Leaflets entire. 



35. Pseudotaenidia. Fruit lance-oblong; lateral wings connivent, somewhat corky; stylopo- 



dium obscure ; oil-tubes solitary in the intervals or double in the lateral intervals. 

 ++ -H- Leaflets serrate or incised. 

 = Involucre none. 



36. Polytaenia. Fruit with thick corky margin, obscure ribs, and very numerous oil-tubes. 



37. Pastinaca. Fruit with filiform dorsal ribs, thin wings, and solitary oil-tubes. 



== = Involucre conspicuous, of several lanceolate deflexed bracts. 

 88. Levisticum. Fruit strongly ribbed ; .oil-tubes solitary. 



H- -H- -n- Leaves decompound, their divisions dissected into linear-filiform segments. 



39. Anethum. Fruit elliptical, rounded at each end ; dorsal ribs thin and sharp, the lateral with 



distinct narrow wings. 



-t- -t- +- Caulescent branching plants, with petals white or nearly so. 



H- Lateral wings closely contiguous ; oil-tubes solitary ; stylopodium thick-conical. 



= Oil-tubes conspicuous, obclavate, extending only one half or two thirds the way to the base ol 



the fruit. 



40. Heracleum. Dorsal ribs filiform, the broad wings with a marginal nerve. Petals con- 



spicuous. Tall stout pubescent perennials, with ternate or pinnate leaves and large 

 incised and toothed leaflets. 

 = = Oil-tubes of more uniform diameter, extending essentially to the base of the fruit. 



41. Imperatoria. Leaves ternately compound ; leaflets broad, ovate to obovate, serrate and 



incised. Stout, terrestrial. 



42. Oxypolis. Dorsal ribs apparently 5, filiform. Leaves pinnate or reduced to hollow cylin- 



drical petioles. Glabrous swamp plants. 

 H- ++ Lateral wings distinct ; oil-tubes usually more than one in each interval. 



43. Conioselinum. Stylopodium slightly conical. Dorsal ribs prominent. Tall slender glabrous 



perennial, with thin finely and pinnately compound leaves. 



44. Angelica. Stylopodium mostly depressed, but the disk prominent and crenulate. Dorsal 



ribs strong. Stout perennials, with coarse 2-3-ternately or -pinnately divided leaves. 



II. Fruit with secondary ribs the most prominent, winged and armed with 

 barbed or hooked prickles, the primary ribs filiform and bristly. 



45. Torilis. Calyx-teeth prominent. Fruit flattened laterally. Seed-face deeply silicate. 



46. Daucus. Calyx -teeth obsolete. Fruit flattened dorsally. Seed-face flat. 



1. ERYNGIUM [Tourn.] L. 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-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. yuccif61ium Michx. (RATTLESNAKE MASTER, BUTTON SNAKEROOT.) 

 Branching above, 0.5-1.7 m. high ; leaves rigid, tapering to a point, the lower 

 4-9 dm. long, the margins remotely bristly ; heads ovoid-globose, 1.8 cm. long, 

 with ovate-lanceolate mostly entire cuspidate-tipped bracts shorter than the 



GRAY'S MANUAL 39 



