218 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



2. Osmorrhiza longistylis (Torr.) DC. Sweet cicely. 



Moist woods; common. May. Widely distributed in N. Amer. (Washingtonia 

 longistylis Britton.) 



6. CHAEROPHYLLUM L. Chervil. 



1. Chaerophyllum procumbens (L.) Crantz. 



Moist woods or edges of marshes along the Potomac and Eastern Branch; frequent. 

 Apr.-May. Eastern N. Amer. 



Chaerophyllum bulbosum L., a tall perennial species, native of Eur., was collected 

 in Washington in 1899 and 1902. 



7. DEEINGA Adans. 



1. Deringa canadensis (L.) Kuntze. Honewort. 



Moist woods, chiefly along Rock Creek and the upper Potomac. June-July. 

 Eastern N. Amer. (Cryptotaenia canadensis DC.) 



8. PASTINACA L. 

 1. Pastinaca sativa L. Parsnip. 



Waate ground ; infrequent. June-July. Naturalized from Eur. 



9. HEBACLEUM L. 

 I. Heracleum lanatum Michx. Cow parsnip. 



Collected by Ward on High Island; probably extinct now. May-June. Widely 

 distributed in N. Amer. 



10. ANGELICA L. Angelica. 

 1. Angelica villosa (Walt.) B. S. P. 



Dry soil; frequent. July-Aug. Eastern U. S. (Archangelica hirsute Torr. & 

 Gray.) 



11. OXYPOLIS Raf. 



1. Oxypolls rigidlor (L.) Raf. Cowbane. 



Swamps, northeastward. Aug.-Sept. Eastern U. S. (Archemora rigxda DC.) 



12. THASPIUM Nutt. Meadow parsnip. 

 1. Thaspium barblnode (Michx.) Nutt. 

 Woods; frequent westward. May-June. Eastern U. S. 



13. TAENIDIA Drude. 



1. Taenidia integerrima (L.) Drude. Yellow pimpernel. 



Rocky woods along Rock Creek and the upper Potomac. May-June. Eastern N. 

 Amer. (Pimpinella integerrima A. Gray.) 



14. ZIZIA Koch. Meadow parsnip. 



Basal leaves, simple, heart-shaped ; stems finely pubescent l. z. cordata. 



Basal leaves compound, with several leaflets; stems glabrous 2. Z. aurea. 



1. Zizia cordata (Walt.) DC. 



Dry or moist woods; frequent. Apr.-May. Eastern U. S., westward to Oreg. 

 ( Thaspium trifoliatum of Ward's Flora.) 



2. Zizia aurea (L.) Koch. 



Woods along the upper Potomac. Apr.-May. Eastern N. Amer. {Thaspium 

 aureum Nutt.) 



