KEY TO THE AMERICAN SPECIES OF THE SUBGENUS 

 ANTHODENDRON 



Corolla rotate or rotate-campanulate, more or less two-lipped; stamens 7 to 10, 

 rarely 5 or 6. (Sect. Rhodora). 

 Stamens 10; corolla two-lipped with the two lower lobes divided to the base, 

 rose-purple; leaves tomentulose beneath, glaucous. 



R. canadense, p. 120. 

 Stamens 5 to 7; corolla with short tube, slightly two-lipped, pink or whitish, 



spotted; leaves glabrous and green beneath R. Vaseyi, p. 122. 



Corolla funnel-form, subregular, the tube longer or little shorter than the lobes; 

 stamens 5. (Sect. Pentanthera). 

 Color of corolla yellow or orange to scarlet and red, rarely white or pinkish with 

 a large yellow blotch. 

 Corolla white or pinkish with large yellow blotch, the tube gradually dilated 

 above the middle; flowers with or after the leaves. 



R. occidentale, p. 125. 

 Corolla orange or yellow to scarlet or red. 

 Flowers with or shortly after the leaves; winter-buds glabrous. 

 Corolla-tube more or less glandular outside, about as long or shorter 



than the lobes, yellow to scarlet R. calendulaceum, p. 127. 



Corolla-tube finely pubescent and glandless outside, longer than the lobes, 



red to scarlet . . R. speciosum, p. 131. 



Flowers before the leaves; winter-buds pubescent; corolla yellow, the tube 



often reddish . , R. austrinum, p. 146. 



Color of corolla white to deep pink or carmine, crimson in R. prunifolium, with- 

 out a conspicuous yellow blotch. 

 Flowers before or with the leaves. 

 Flower-buds without prominent rows of stipitate glands at apex; much 

 branched shrubs usually more than 0.5 m. tall, rarely low. 

 Corolla-tube more or less pilose, glandular or eglandular, gradually dilated 

 near the apex. 

 Corolla-tube about as long as the lobes, dilated above the middle; 

 stamens declinate; corolla usually pink. 

 Leaves glabrous beneath except the strigose midrib, bright green; 

 corolla hirsute and glandless or glandular-pilose outside; winter- 

 buds glabrous rarely thinly pubescent . . R. nudiflorum, p. 134. 

 Leaves pubescent beneath, sometimes nearly glabrous except along 

 the midrib beneath, often bluish green; corolla glandular out- 

 side; winter-buds pubescent R. roseum, p. 138. 



Corolla-tube distinctly longer than the lobe, glandular or eglandular; 

 corolla white; winter-buds glabrous; leaves pubescent and glauces- 



cent beneath R. alabamense, p. 141. 



Corolla-tube densely and finely villose and sparingly stipitate-glandu- 

 lar or eglandular, slender and abruptly expanded at apex; winter- 

 buds pubescent; leaves usually pubescent beneath. 



R. canescens, p. 143. 

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