106 FAM. 134. 



S. (L.) divaricatus. Stems with slender branches; leaves twice or thrice pinnately 

 parted. Sandy soil. Spring. 



5. Leaves pinnately or ternately compound, leaflets toothed, pinnatifid 



or dissected, -----------Q 



6. Calyx-teeth obsolete, ------- - - _ 7 



6. Calyx-teeth acute; — caulescent herbs with pinnately-compound leaves; 



involucres and involucels of narrow bracts; petals white; fruit 



stout; seeds 5-angled, - - - - - Sium, Water Parsnip 



S. cicutaefolium (lineare). Leaflets 7-17, sharply serrate; submerged leaves, 

 sometimes finely dissected; umbels peduncled. In shallow water. Sum- 

 mer and Fall. 



7. Petals concave, not emarginate; — caulescent herbs with pinnately 



or ternately decompound leaves, and toothed or incised leaflets; 

 involucres present or wanting; petals white; seeds terete or 

 slightly angled, >__--____ Apium 



A. graveolens, Celery. Leaves on long petioles, pinnately divided; segments 

 broad-cuneate, incised; upper-leaves 3-parted and cut-lobed; involucres 

 wanting. Cultivated. 



7. Petals emarginate, inflexed; — caulescent herbs with pinnately or ter- 



nately decompound leaves; involucres various; petals white; 



seeds sub-terete. Cultivated. - - - - - - . Carum 



C. petroselinum, Parsley. Leaf-segments numerous, wedge-ovate to oblong, 

 incised; bracts few or none, bractlets subulate. 



C. carvi, Caraway. Leaf-segments numerous, linear; bracts 1 or none, bract- 

 lets none; fruit oblong, aromatic. 



8. Ribs prominent and the lateral ones broadly winged; — caulescent 



herbs, strongly scented; involucres and involucels present or 



wanting; petals white or greenish, broadest above the middle. Angelica 



A. dentata. Stems simple or branching above; leaves glabrous, ternately de- 

 compound, on long petioles; leaflets oblong to oblanceolate, incised-serrate; 

 umbels few or solitary; rays 5-12; oil-tubes about 20. Dry pineland. Sum- 

 mer. 

 8. Ribs thin and the lateral ones winged; — caulescent marshy herbs 

 with smooth foliage; bracts and bractlets 5-6; flowers white. 

 Summer and Fall. - - - - - Oxypolis (Tiedemannia) 



O. fliformis (T. teretif olia) . Stems simple or branched above; the leaves re- 

 duced to elongated, hollow, jointed phyllodes; bracts subulate; rays slender 

 6-16. Swamps. Summer and Fall. 



O. ternata. Stems somewhat branched; leaves entire or divided into 3 linear 

 leaflets; rays very slender. Low ground. Fall. , 



134. Monotropaceae, Indian Pipe Family. 



Herbs, saprophytic on decayed vegetable matter, or 

 parasitic on roots; the scape-like stems solitary or clus- 

 tered; leaves reduced to scales, which are often imbricated; 

 flowers usually perfect, solitary, nodding; sepals 2-6, imbri- 

 cated; petals 3-6, distinct or partially united, rarely want- 

 ing; stamens 6-12, distinct or united at the base; ovary 



