86 American Midland Naturalist Monograph No. 4 



Leaves J/2 to I J/2 inches across, 3-lobed; flowers yellow; found at Crater 



Lake 7. R. er^throcarpum. 



Flowers bell-shaped or tubular; leaves J/2 to 3 inches across. 



Flower-clusters about 1 inch long, not stalked or scarcely so, few-flowered; 

 flower-tubes 2 to 6 times as long as the lobes; leaves J/2 to 1 1^-4 inches 

 across. 



Flowers yellow, J/2 to 1 inch long; leaves more or less fan-shaped, 3 - 

 lobed, the margins few-toothed, smooth ; berries yellow, reddish, 

 or dark purple, smooth or glandular-hairy; found in Rocky 

 Mountains and Southwest 8. R. aureum. 



Flowers greenish-white to pinkish-Iavcnder ; leaves roundish, the margins 

 irregularly toothed, glandular-hairy; berries bright red, gland- 

 dotted or glandular-hairy; widespread species 9. R. cereum. 



Flower-clusters I to 4 inches long, distinctly stalked; flower-tubes J/i to 2 times 

 as long as lobes; leaves 1 to 3 inches across. 



Flowers greenish-white or tinged with pink; widespread sj>ecies 



- 10. R. viscosissimum. 



Flowers pink to red; found on Pacific slope. 



Leaves thickish, green and thinly hairy above, paler and usually hairy 

 below, somewhat glandular; flowers scattered loosely along 



flowering-stems; found in parks of the Northwest 



- 1 1 . R. sanguineum. 



Leaves thinnish, green and smooth on both sides or very finely 

 glandular-hairy; flowers bunched near outer ends of flower- 

 ing-stems; occurs in Sierra Nevada 12. R. nevadense. 



B. Stems usually armed with spines and sometimes prickly. 



Spines several below the leaves, or sometimes none; stems usually prickly between the 

 nodes; flowers saucer-shaped, greenish or purplish-red, borne in several- to 

 many-flowered clusters; berries falling from stems without stalks. 

 Berries red; leaves dull green and more or less glandular hairy on both sides 



1 3. R. montigenum. 



Berries purple-black; leaves dark green, smooth or sparingly hairy 



- - ..-- — 14. R. lacuslre. 



Spines 1 to 3 below the leaves, or sometimes none; stems not usually prickly between 

 the nodes; flowers bell-shaped or tubular, color various, borne singly or in 

 groups of 2 to 6; berries falling with short stalks attached. 

 Berries smooth, hairy, or bristly with gland-tipped hairs. 

 Flowers J/2 to 1 inch long, dark reddish-purple. 



Flowers nearly 1 inch long; berries densely covered with short gland- 

 tipped hairs; found in parks of the Northwest 15. R. Lohhi. 



Flowers mostly % inch or less long; berries covered with gland-tipped 



hairs and short stiff bristles; found in Sierra Nevada 



16. R. amarum. 



Flowers J/4 to 1/3 inch long, whitish, greenish, or yellowish, sometimes 

 tinged with violet; widespread species. 



Flower-tubes smooth or thinly hairy; berries smooth. 

 Leaves ^/j, to 2 inches across. 



Calyx-lobes about twice as long as tube, shorter than the sta- 

 mens; found in the Northwest 17. R. divaricalum. 



Calyx-lobes about as long as the tube, as long as or slightly 

 longer than the stamens; widespread species. 



