1258 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Calyx without glandular pubescence. 



Pubescence of the corolla glandular 32. S. dugesiu 



Pubescence of the corolla chiefly eglandular. 



33. S. lasiantha. 

 Pedicels 3 to 9 mm. long; racemes loosely flowered; calyx in 

 anthesis 6 mm. long or more. 

 Calyx purplish violet, glandular-villous, in anthesis nearly lO 



mm. long 34. S. semiatrata. 



Calyx green or blue-tinged, glandular-puberulent and minutely 

 hispidulous on the nerves, in anthesis about 6 mm. long. 



Leaves oblong or narrowly ovate 35. S. rupicola. 



Leaves broadly ovate 36. S. gonzalezii. 



EE. Leaves only slightly rugose, narrow-ovate, mostly acuminate. 

 Flowers in small cymes, these arranged in a terminal thyrse. 



37. S. thyrsiflora. 

 Flowers in simple or branched racemes. 



Branches pubescent with soft ascending hairs. 



38. S. multiramea. 

 Branches short-pilose with recurved-spreading hairs. 



Calj^ tubular, in fruit 5 mm. long, the tube 4 times as 



long as the lobes 39. S. alamosana. 



Calyx campanulate, in fruit 6 to 7 mm. long, the tube twice 



as long as the lobes 40. S. chapalensis 



A A. Corolla 2 to 12 cm. long, variously colored, often scarlet or yellow. 

 Corolla yellow. 



Flowers axillary, solitary 41 S. aspera. 



Flowers racemose 42. S. chrysantha. 



Corolla not yellow. 

 Calyx inflated-campanulate. Corolla scarlet. 



Stems viscid-hirsute 43. S. adglutinans. 



Stems not viscid-hirsute. 

 Leaves chiefly ovate-lanceolate to oblong, cuneate or narrowed at 



base 44. S. sessei. 



Leaves broadly ovate to orbicular. 

 Leaves pubescent beneath on the nerves, 4 cm. long or less; 



branches glabrate 45. S. regla. 



Leaves tomentose beneath, usually more than 4 cm. long; 

 branches tomentose or puberulent. 



Branches tomentose 46. S. pubescens. 



Branches puberulent 47. S. muralis. 



Calyx tubular-campanulate, not inflated. 

 F. Corolla ventricose, the tube straight. 

 G. Leaves 1 to 4 cm. long. 



Flowers axillary 48. S. disjuncta. 



Flowers in terminal racemes. 



Leaves narrowly oblong to linear-oblanceolate 49. S. greggii. 



Leaves ovate or broadly oblong. 



Pubescence of branches and leaves stellate__50. S. oaxacana. 

 Pubescence of branches and leaves simple. 



Calyx glabrous, or barely puberulent at base_51 S. oresbia. 

 Calyx hispidulous on the nerves. 



Leaves glabrous or glabrate beneath 52. S. grahami. 



