342 



UMBELLIFERiE. 



Stems tall, angular and channeled, branching and leafy; flowers 



yellow 26. Pastinaca. 



Oil-tubes reaching only half way to the base of the fruit; marginal 

 flowers of umbel with radiately enlarged corollas; tall coarse 

 plants 27. Heracletjm. 



1. BOWLESIA R. & P. 



Delicate annuals with stellate pubescence, opposite leaves and scari- 

 ous lacerate stipules. Umbels simple, few-flowered, on short axillary 

 peduncles. Flowers white, minute. Calyx-teeth prominent. Fruit 

 ovate, somewhat flattened laterally, with narrow commissure, turgid, 

 becoming depressed on the back. Ribs and oil-tubes none. (William 

 Bowles, 1705-1780, Irish naturalist and traveler.) 



1. B. lobata R. & P. Branching, the stems diffuse or procumbent, 

 ^ to 2 ft. long; leaves thin, reni form-cordate, mostly o-lohed and some 

 of the lobes 1 or 2-toothed; petioles 1 to 3 in. long or less; umbels 1 

 to 4-flowered; fruit 1 line long. 



Shade of rocks or shady banks in the Coast Ranges from Petaluma, 

 San Francisco, Oakland Hills, San Leandro Creek. Santa Lucia 

 Mountains and southward to Southern California. Also in the Sierra 

 Nevada (San Andreas, Mokelumne Hill). Apr. 



2. HYDROCOTYLE L. 



Perennial herbs without erect stems, the peduncles and leaves from 

 creeping stems or rootstocks. Leaves simple, round in outline, long- 

 petioled. Flowers in a small umbel, or disposed in 2 or more umbels 

 w T hich are proliferous one above the other. Fruit flattened laterally, 

 suborbicular, acutely margined and with 1 or 2 ribs on each side. 

 Oil-tubes none. (Greek hudor, water, and cotule, a low vessel, the 

 peltate leaves of some species being saucer-shaped.) 



Leaves not peltate, 5 or 6-cleft; umbels simple 1. if. ranunculoides. 



Leaves peltate, slightly crenate ; umbels proliferous . .2. H. prolifcra. 



1. H. ranunculoides L. f. Water Pennywort. Glabrous; 

 stems floating or creeping in mud, rooting at the nodes; leaves orbicu- 

 lar, 5 or 6-cleft, the lobes crenate, 1£ in. broad or less; petioles 3 to 5 

 in. long; peduncles 1 to 2 in. long, reflexed in fruit; pedicels £ line 

 long; fruit ovoid, 1 line broad or feroader; ribs obscure. 



Pools or muddy shores often floating in rather deep water: San 

 Francisco to San Jose. May. 



2. H. prolifera Kell. Marsh Pennywort. Descending 

 branches of the rootstock tuberous-enlarged; umbels proliferous, one 

 above the other in 3 or 4 whorls (each whorl 5 to 15-flowered); leaves 

 orbicular-peltate, emarginate at base, slightly crenate, 1\ to If in. 

 broad, petioles 10 to 13 in. long; peduncles nearly as long; ^pedicels 1 

 to 3 lines long; mature fruit 1 line long and slightly broader, slightly 

 notched at apex. 



Suisun Marshes and southward to Southern California. 



3. ERYNGIUM L. Button Snakeroot. 

 Perennials with clustered fibrous roots, often dichotomously branch- 



