74 



American Midland Naturalist Monograph No. 4 



Fig. 26. Oregon grape {Mahonia aquifolium) . 



5. Piper Mahonia, Piper Hollygrape (Mahonia Pipenana Abrams). 

 — Erect shrub 2/3 to 2 feet high; leaflets 5 to 9, egg-shaped, 1 to 21/2 inches 

 long, glossy-green above, dull below with fine protuberances, the margins 

 spine-toothed with slender spines; flowers yellow, borne in rather dense clus- 

 ters 1^ to 2% inches long; berries blue-black, narrowly ovoid, about ^ inch 

 long. (Syn. Berberis Piperiana (Abrams) McMinn.) 



Occurrence. — crater lake: north wall of Red Blanket canyon near southwestern 

 park boundary. 



6. Cascades Hollygrape, Cascades Mahonia (Mahonia nervosa 

 (Pursh) Nutt.). — Low shrub 6 to 18 inches high; leaves about as long as 

 the flowering stem and clustered at its base; leaflets 9 to 21, dark green, 

 shiny, about 1 to 3 inches long, broadly lance-shaped to egg-shaped, pointed 

 at the tip, the margins spine-toothed; flowers yellow, borne in oblong clusters 

 2 to 6 inches long, these single or in bunches of several at the ends of the 



