AMMIACEAE. 253 



3. Aletes humilis C. & R. In the mountains of Colo.— Dale Creek, Larimer 

 Co. 



10. BERtJLA Hoffm. Cut-leaved Water Parsnip. 



i. Berula erecta (Huds.) Coville. (B. angustifolia Koch) In water from 

 Ills., Minn, and B. C. to Tex. and Calif.— Alt. 4000-6000 ft.— Ft. Collins; 

 Poudre flats ; Boulder. 



II. LIGUSTICUM L. Lovage, Angelica. 



Leaves twice or thrice compound ; first divisions ternate. 

 Stem leafy ; divisions of the leaves not filiform. 



Leaves thin, dark green. i. L. Porteri. 

 Leaves thicker, pale green. 2. L. afhne. 

 Plant subscapose or viit\i a single leaf ; ultimate divisions of the leaves linear- 

 filiform. 3. L. tenuifoliuni. 

 Leaves once pinnate ; plant scapose. 4. L. Eastwoodii. 



I. Ligusticum Porteri C. & R. In mountain woods from Wyo. to N. M. 

 and Ariz. — Alt. 8000-12,000 ft. — Lake City ; near La Plata Post Office ; Engel- 

 mann Canon; Georgetown; headwaters of Pass Creek; headwaters of Sangre 

 de Cristo Creek ; Turkey Creek and tributaries ; Veta Mountain ; Mirror Lake ; 

 near Pagosa Peak; Columbine; Cerro Summit; Crested Butte; mountains 

 west of. Steamboat Springs; mountains between Sunshine and Ward. 



■i. Ligusticum affine A. Nels. Open, moist hillsides in Wyo. and Colo. — 

 Summit of North Park Range, Larimer Co. 



3. Ligusticum tenuifolium S. Wats. In mountain woods from Ida. and Ore. 

 to Colo.— Middle Park; South Park. 



4. Ligusticum Eastwoodii C. & R. In the mountains of Colo, and S. 

 Wyo. — Alt. 10,000-11,000 ft. — Mountains above Ouray; Bear Creek Divide; 

 Pagosa Peak; Keblar Pass; La Plata Mountains. 



12. MUSENION Raf. 



I 

 Fruit glabrous or slightly puberulent. i. M. divaricatum. 



Fruit strongly scabrous puberulent. 2. M. angustifolium. 



1. Musenion divaricatum (Pursh) C. & R. In dry ground from Ass. and 

 Alb. to S. D. and Colo. — Alt. 4000-6000 ft. — North Denver; outside of Dixon 

 Caiion ; north of La Porte ; foot-hills, Larimer Co. ; Spring Canon ; west 

 of Loveland; Boulder. 



a. Musenion angustifolium Nutt. In arid valleys in hard ground of Ass. 

 and Alb. to Colo. — Alt. 4000-5000 ft. — Plains near Denver. 



13. AULOSPERMUM C. & R. 



Clusters of leaves and peduncles borne at the summit of a more or less elongated 

 stem. 

 Corolla yellow. 



Rachis of the primary leaf -segments dilated ; secondary segments confluent, 



broad, toothed or merely cleft. i. A. longipes. 



Rachis of the primary leaf-segments not dilated ; secondary segments distinct, 

 finely dissected into small oblong lobes. 2. A. angustum. 



Corolla purple. 3. A. planosum. 



Leaves clustered at the base ; plant acaulescent. 4. A. purpureum. 



