FLOWERING PLANTS AND FERNS OF ARIZONA 867 



Key to the species 



1. Valves of the capsule near the summit; leaves sessile, ovate or the upper 



narrower 1. S. biflora. 



1. Valves of the capsule at or below the middle; leaves strongly cordate-clasping, 

 or the lower ones merely sessile 2. S. perfoliata. 



1. Specularia biflora Ruiz and Pa von) Fiseh. et Mev., Index Sem. 



Hort. Petrop. 1: 17. 1835. 



Campanula biflora Ruiz and Pavon, Fl. Peruv. Ckil 2: 55. 1799. 



Gila County and southward. 5.300 feet or lower, April to June. 

 Southern Virginia to Arkansas, southern Arizona, coastal California, 



and southward; South America. 



2. Specularia perfoliata (L.) A. DC, Monog. Campan. 351. 1830. 



Campanula perfoliata L., Sp. PL 169. 1753. 



Coconino County and southward. 7.500 feet or lower, spring and 

 summer. Southern Ontario to southern British Columbia, south to 

 the West Indies, southern Mexico, Arizona, and northern California. 



3. NEMACLADUS 



Plants diffusely branched, with delicate slender stems, 5 to 30 cm. 

 high; cauline leaves reduced to subulate or linear bracts; flowers 

 loosely racemose on all the branches; corolla white or purplish tinged. 

 more or less bilabiate; ovary and capsule bilocular. or sometimes 

 becoming unilocular. 



Key to the species 



1. Capsule 2.3 to 5 mm. long, free from the calyx its entire length; corolla tube 

 2 to 3 mm. long, usually exceeding the calyx lobes; corolla (in the Arizona 



variety 3 to 3.5 mm. long 1. N. longifloro. 



1. Capsule 1.0 to 2.0 'rarely 2.5) mm. long, free from the calyx about half its 



length; corolla tube not more than 1.5 mm. long, usually exceeded by the 



calyx lobes (2). 



2. Anthers 0.4 to 0.8 mm. long; lower part of the stem silvery-gray, shining; 



corolla lobes united at the very base only, the lobes much longer than 



the tube 3. X. rubescens. 



2. Anthers 0.1 to 0.3 (rarely 0.4) mm. long; lower part of the stem purplish or 

 brownish, lacking a silvery-gray sheen (3). 

 3. Seeds pitted, the pits in about 10 rows of 10 to 12 each; pedicels usually 

 spreading in a graceful double curve; corolla tubular, the tube equaling 



the lobes or nearly so 2. X. gracilis. 



3. Seeds with distinct, somewhat flattened, longitudinal ridges separated by 

 sharply impressed lines, each ridge divided by 15 to 20 fine transverse 

 lines; pedicels usually somewhat ascending, distinctly stiff; corolla 

 deeply divided, the lobes longer than the tube. 



4. X". GLAXDULIFERUS 



1. Nemacladus longiflorus A. Gray, Amer. Acad. Arts and Sci. Proc. 

 12: 60. 1876. 



Represented in Arizona by var. breviflorus McVaugh, of which the 

 type (Peebles et ah, 3754) was collected between Tucson and Sells 

 (Pima County), about 2.300 feet, sandy soil. This is the only known 

 Arizona locality. 



The variety, as well as the typical form of the species, occurs most 

 abundantly in the deserts and desert mountains o( southern Cali- 

 fornia. The typical form of the species, with corolla 5.0 to S.O mm. 

 long, has not been reported from Arizona. 



