FLOWERING PLANTS AND FERNS OF ARIZONA 683 



Key to the species 



1. Pods torulose (constricted between the seeds on the edges as well as on the 

 faces), more or less compressed; corolla lobes 4 to 7 mm. long (2). 

 2. Stems and leaves lanate-tomentose, the hairs subappressed ; pods pubescent, 

 usually permanently so; corolla tube and throat 8 to 12 mm. long. 



1. A. TOMEXTOSA. 



2. Stems, leaves, and pods glabrous (3). 



3. Blades of the upper leaves lanceolate or ovate-lanceolate; corolla tube 

 and throat 7 to 10 mm. long 2. A. brevifolia. 



3. Blades of the upper leaves linear or linear-lanceolate; corolla tube and 



throat 10 to 20 mm. long 3. A. eastwoodiaxa. 



1. Pods not torulose (4). 



4. Lobes of the corolla very nearly as long as the tube, 5 to 7 mm. long; plant 

 glabrous; leaf blades broadly ovate to ovate-oblong, 3 to 5 cm. long, 

 1.5 to 3 cm. wide, slightly glaucous; calyx 2 mm. long._ 4. A. joxesii. 

 4. Lobes of the corolla not more than half as long as the tube (5). 



5. Corolla tube very slender below, swollen toward the apex, slightly con- 

 stricted just below the limb but without a distinct neck, 16 to 18 mm. 

 long; lobes of the corolla about 10 mm. long, half as long as the tube, 

 plant glabrous; leaves slightly dimorphic, the upper ones almost 

 filiform, shorter and more crowded than the middle ones. 



5. A. GRAXDIFLORA. 



5. Corolla tube relatively stout, swollen near the middle, usually strongly 

 constricted below the limb and with a distinct neck ; lobes of the corolla 

 less than 10 mm. long, rarelv more than one-third as long as the 

 tube (6). 

 6. Pods compressed, regularly but shallowly impressed on the faces be>- 

 tween the seeds, about 6 mm. wide at maturity, glabrous; seeds 

 fully 10 mm. long; herbage soft-villous with spreading hairs, rarely 

 glabrate; leaves short -petioled, the blades of the upper ones lanceo- 

 late, 5 mm. wide or wider; corolla lobes 3 to 4 mm. long. 



6. A. kearxeyaxa. 



6. Pods terete or nearly so, not impressed between the seeds or irregularly 



and obscurely so, 3 to 4 mm. wide; seeds (so far as known) seldom 



more than 8 mm. long (7). 



7. Leaf blades linear-lanceolate to ovate-lanceolate, the largest ones 



sometimes 2 cm. wide; calyx lobes long-ciliate; herbage glabrous 



to villous; corolla lobes 4 to 8 mm. long 7. A. hirtella. 



7. Leaf blades mostly linear, the lower ones narrowly lanceolate or 

 oblanceolate, all much less than 1 cm. wide; calyx and herbage 

 glabrous or very nearly so (8) . 

 8. Corolla lobes 3 to 4 mm. long, one-fifth to one-third as long as the 



tube, the latter 10 to 15 mm. long 8. A. palmeri. 



8. Corolla lobes 7 to 12 mm. long, fully one-third as long as the tube, 

 the latter 16 to 18 mm. long 9. A. peeblesii. 



1. Amsonia tomentosa Torr. and Frem. in Frem., Exped. Rocky 



Mount, Rpt. 316. 1845. 



Along the Big Sandy River, southern Mohave County (Goodding 

 6379). Southern Nevada, western Arizona, and southeastern 

 California. 



Goodding's collection represents the typical broad-leaved form of 

 the species. A narrow-leaved form, var. stenophylla Kearney and 

 Peebles, occurs in Monument Valley (Navajo County) and along the 

 Colorado and Little Colorado Rivers (eastern Coconino County), 

 about 5,000 feet. This variety is nearly intermediate between 

 A. tomentosa and A. arenaria Standi., the latter being a species of 

 western Texas, southern New Mexico, and Chihuahua. 



2. Amsonia brevifolia A. Gray, Amer. Acad. Arts and Sci. Proc. 12: 



64. 1876. 

 Known in Arizona only by the type collection at Mokiak Pass, 

 northern Mohave County (Palmer 302) , flowering in spring. Southern 

 Utah and northern Arizona to southern California. 



