COMPOS ITAE 147 



BACCHARIS. Groundsel Tree. 



Deciduous shrubs with moderately slender sharply angled 

 green twigs with resin-passages in the bark; somewhat angu- 

 lar pale or brownish homogeneous pith; alternate somewhat 

 raised shallowly U-shaped 3-lobed leaf-scars with 3 bundle- 

 traces; no stipule-scars; round-ovoid solitary sessile buds, 

 with several scales, heavily coated with resin; simple cune- 

 ately stalked coarsely few-toothed leaves; minute perfect gam- 

 opetalous flowers in small green-and-red-involucrate heads 

 mostly clustered toward the ends of the branches; and minute 

 akenes with long finally rather tawny pappus. 

 Leaves oblanceolate or obovate, moderately large. B. halimifolia. 



IVA. Marsh Elder. 



Deciduous seaside half-shrubs with moderately slender 

 angled at length brownish twigs with resin-passages in the 

 bark; roundish homogeneous pith; opposite or whorled trans- 

 verse leaf-scars with 3 bundle-traces; no stipule-scars; rounded 

 sessile few-scaled buds; simple rather fleshy more or less 

 3-nerved leaves; minute monoecious gamopetalous flowers in 

 small drooping involucres; and minute akenes without pappus. 

 Leaves coarse-toothed. I. oraria. 



Leaves subentire. I. imbricata. 



