OP THE WASATCH REGION 65 



ORDER UMBELLALES. 



UMBELLIFER-ffi. Carrot or Parsley Family. 



Herbs mostly with hollow stems. Leaves mostly 

 compound, more or less clasping at the base. Flowers 

 small; in simple or compound umbels. Calyx-tube 

 adnate to the ovary; its margin truncate or 5-toothed. 

 Petals 5, epigynous. Stamens 5. Pistils with 2 styles 

 and a 2-celled. "inferior" ovary, each cell of which 

 contains a single ovule. Fruit a pair of cremocarps. 



"Umbels usually compound, forming umbellets. The 

 bracts under the general umbel form an involucre; 

 under an umbellet an involucel. The enlarged base 

 of the style is the stylopodium, which is often sur- 

 rounded by an epigynous disk. Each carpel usually 

 has 5 longitudinal ribs; in the intervals are usually 

 one or more longitudinal oil-tubes or vittae. The face 

 by which the 2 carpels cohere is the commisure; a 

 slender prolongation of the axis between them is the 

 carpophore ; this is apt to split into 2 branches, a carpel 

 suspended from the tip of each." Coulter's Manual 

 of Rocky Mountain Botany, page 113. 



Mature fruit is necessary for determination of the 

 genera and species. 



Oil-tubes wanting or obscure in the mature fruit. 



Flowers white . 1. Osmorrhlzn 



Flowers yellow or purple 2. Leptotaeniu 



Oil-tubes distinct. 



Fruits strongly flattened dorsally. 



Leafy-stemmed, tall, stout, branched. 



Stem smooth; flowers yellow 3. Pastinaca 



Stem woolly; flowers white 4. Heracleum 



Mostly short-stemmed; lateral ribs thick. 2. Leptotaenia 

 Mostly without above-ground stem; lateral ribs 



thin 5. Cogswcllia 



Fruits not dorsally flattened. 



With more than 1 oil-tube in each interval. 

 Seed-face sulcate or decidedly con- 

 cave 6. Aulospermtim 



% Seed-face slightly concave 7. Orogenia 



With a single oil-tube in each interval.. . 8. Zizla 



