Carrot Family. 61 



\ f Fruit flattened dorsally; xl.iylMy in Thasplum. 

 Pastinaca. Leaves pinnately compound ; dorsal ribs filiform, the lateral extending Into 



wings. 

 Polytaisnia. Leaves 2-pinnate ; fruit with the lateral ribs thick corky, dorsal ribs ob- 

 scure. 

 Thaspicim. Leaves 2 3-ternate; fruit oblong, with 5-7 wings, slightly flattened. 



f f f Fruit flattened laterally. 

 Foeniculhm. Leaves dissected into filiform segments ; ribs prominent. 

 Pimpinella. Leaves ternately compound; ribs slender. 

 Zizi». Leaves 2-8-ternate ; fruit oblong, with filiform ribs ; stylopodium wanting. 



DAUCUS L. Biennials, with bristly stems, and pinnately decompound 

 leaves. Involucre of foliaeeous pinnately parted bracts. Involucels of many 

 entire or toothed bracts. Flowers white, umbels compound, concave. Calyx 

 'teeth obsolete. Petals 5, the 2 outer often larger and deeply 2-cleft. Fruit 

 oblong, dorsal ly, flattened, with 5 bristly primary ribs and 4 winged second- 

 ary ones. Stylopodium depressed. 



D. carrota L. The common cultivated carrot, frequently found wild in 

 cultivated fields and waste places; July-September; Dubuque, Fayette, Story, 

 Appanoose, and Decatur counties. 



CONIOSELINUM Hoffm. An erect glabrous perennial, with pinnately 

 decompound leaves, involucre none or of few bracts, involucels of narrow 

 linear bracts, and compound umbels of white flowers. Calyx-teeth none. 

 Fruit oval or oblong, flattened, glabrous; dorsal ribs large, lateral broadly 

 winged; oil- tubes usually 2 or 3 in the intervals. Stylopodium slightly coni- 

 cal. 



C. canadense T. & G. Stem striate, 2-5 feet high; leaves decompound 

 into linear oblong segments. Reported from Scott and Story counties. 



TIEDEMANNIA DC. Glabrous perennials. Involucre and involucels 

 present. Flowers white. Calyx 5-toothed. Fruit elliptic-ovate, dorsally 

 compressed, glabrous; ribs equidistant, obtuse, the lateral ones broadly 

 winged; oil-tubes solitary in the intervals and 2-6 on the inner face. Stylo- 

 podium short, thick, conical. 



T. rigida (L.) Coult. & Rose. Whole plant smooth; stem 2-6 feet high, 

 terete, striate, hollow, simple or sparingly branched; leaves all simply 

 pseudo-pinnate; common petiole channeled, somewhat margined; leaflets 

 lanceolate to linear, often slightly falcate, sessile, entire or remotely toothed 

 toward the apex; umbels terminal and lateral. Sloughs and uplands; 

 August; common; Johnson, Benton, Jasper, Story, Decatur, and Ringgold 

 counties. (Oxypolis riaiO.ttx (L.) Britton ) 



MERACLEUM L. Perennials, with ternately compound leaves, and white 

 flowers in large umbels. Involucre of few bracts, deciduous. Inyolucels of 

 small bracts. Calyx-teeth small or obsolete. Petals obeordate, the 2 outer 

 often larger and 2-cleft. Fruit obovate, flattened, somewhat pubescent; 

 dorsal ribs 3, obtuse, the lateral broadly winged. Stylopodium thick, conic. 



H- lanatum Mx. Cow-Parsnip. Pubescent or woolly, 4-8 feet high; petioles 

 much dilated; leaflets 3, petiolulate, round cordate, about 3-lobed; irregularly 

 cut-toothed. Moist woods; June-July; frequent and generally distributed; 

 Winneshiek, Allamakee, Fayette, Story, Winnebago, Webster, Calhoun, Cerro 

 Gordo, Decatur, Union, Pottawattomie, Shelby, Woodbury, and Emmet 

 counties. 



SIU/W L. Smooth perennials, with simply pinnate leaves, the lower often 

 pinnatisected, and compound umbels of white flowers. Involucre and involu- 

 cels of numerous narrow bracts. Calyx-teeth minute. Fruit glabrous, ovate 



