CARROT FAMILY 217 



Leaf-divisions many, incised or serrate; ribs prominent or 



somewhat winged. 22. Ligusticum. 



Ribs corky; stylopodium absent or low; plants of marshes or 



stream banks. 

 Styles short, less than half the length of the fruit; fruit 



ovoid to subglobose. 23. Cicuta. 



Styles long, about half the length of the fruit; fruit sub- 



cylindric. 24. Oenanthe. 



Plants low, acaulescent; involucre absent. 



Plants pubescent. 



Pedicels of the flowers subequal; sepals not rigid. 



25. Podistera. 



Pedicels of the sterile flowers longer than or equaling the fruit; sepals 

 rigid. 26. Oreonana. 



Plants glabrous. 



Fruit orbicular, the ribs 7, corky; leaves coriaceous. 



27. Rhysopterus. 

 Fruit linear-oblong to oblong; leaves thin. 



Ribs unequal, the lateral conspicuously corky-thickened. 



28. Orogenia. 



Ribs equal, filiform. 31. Tauschia. 



Flowers yellow. 



Involucel absent; leaf-divisions filiform; plants with anise odor. 29. Foenicnlum. 

 Involucel present; leaf-divisions linear to ovate; plants without anise odor. 

 Basal leaves simple; stem-leaves simple, ternate or quinate. 30. Zisia. 

 Basal and stem-leaves pinnate, ternate or pinnately or ternately compound. 

 Biennials; stylopodium low, conical. 31. Tauschia. 



Perennials; stylopodium none. 15. Petroselinum. 



Some or all of the ribs of the fruit winged; fruit more or less dorsally compressed. 

 Lateral ribs winged, dorsal ribs filiform. 



Marginal flowers of the umbel with subequal petals; plants lower, mostly slender. 

 Leaves simply pinnate; leaf-divisions mostly ovate. 



Flowers white; aquatic herbs from fascicled tubers. 32. OxypoHs. 



Flowers yellow; plants not aquatic; roots fusiform. 33. Pastinaca. 



Leaves pinnately or ternate-pinnately divided; leaf-divisions mostly linear to filiform. 



Plants annual; stems leafy; leaf-divisions filiform; plants with anise odor. 



34. Anethum. 



Plants perennial; acaulescent or short-caulescent; leaf-divisions mostly broader; 

 plants without anise odor. 35. Lomatium. 



Marginal flowers of the umbel with radiately enlarged petals; tall stout plants. 



36. lieracleum. 

 Lateral, dorsal and intermediate ribs winged or prominent. 



Plants tall; stems leafy. 



Umbellets not capitate. 



Coarse plants; leaf-divisions large, ovate to lanceolate, serrate, toothed or entire. 



37. Angelica. 



Slender plants; leaf-divisions small, oblong, incised or deeply toothed. 



38. Conioseltnum. 



Umbellets capitate. -59. Sphciiosciudimn. 



Plants mostly low, acaulescent. 



Leaf-divisions broad, 0.5-3 cm. wide; maritime. 40. Clchnia. 



Leaf-divisions narrow, mostly less than 0.5 cm. wide; desert and mountain areas. 

 Plants mostly caulescent; bractlets usually inconspicuous; sepals prominent. 



41. Pteryxia. 



Plants acaulescent; bractlets usually conspicuous; sepals not prominent. 



42. Cymopterus. 



Inflorescence capitate, not umbellate. ' 



Fruit winged, not squamose. '*2. Cymopterus. 



Fruit not winged, ribless, variously squamose. '*3. Eryngtum. 



1. HYDROCOTYLE L. Sp. PI. 234. 1753. 



Low perennials growing in or near water, with slender creeping stems. Leaves orbicu- 

 lar, peltate or reniform; umbels simple or proliferous; sepals mmute or obsolete. Petals 

 small, white. Fruit orbicular to ellipsoid, strongly flattened laterally. Carpel with 5 

 primary ribs. Oil-tubes wanting or obscure. [Greek, meaning water-cup. J 



About 75 species, of wide distribution. Type species, Hydrocotyle vulgaris L. 



Leaves peltate; ribs of the fruit broad, thick and corky. 



T /J • 1 k 1 \. H. umbellata. 



Inflorescence a simple umbel. 



r a • i . 1 I . 2. H. vertictllata. 



Inflorescence an interrupted spike. 



Leaves roundish-reniform, not peltate; ribs of the fruit filiform. 3. H. ranunctiloides. 



1. Hydrocotyle umbellata L. Umbellate or Many-flowered Marsh-pennywort. 



Fig. 3465. 



Hydrocotyle umbellata L. Sp. PI. 234. 1753. 



Stems creeping, from tuberiferous rootstocks. Leaves orbicular-peltate, crenate, the petioles 

 slender, erect ; peduncles often equaling or exceeding the leaves ; umbels many-flowered, simple 



