868 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



2. Nemacladus gracilis Eastw., Torrey Bot. Club Bui. 30: 500. 1903. 



Nemacladus ramosissimus Nutt. var. gracilis Munz, Amer. 

 Jour. Bot. 11: 240. 1924. 



This species is included in the flora of Arizona by virtue of a speci- 

 men, now in the herbarium of the Academy of Natural Sciences of 

 Philadelphia, labeled " Central Arizona" (Palmer 300). The range of 

 the species lies west of the Mohave and Colorado Deserts for the most 

 part, and, although it is known from Clark County, Nevada, and 

 eastern San Bernardino County, Calif., there are no authentic modern 

 records of its occurrence in Arizona. 



3. Nemacladus rubescens Greene, Calif. Acad. Sci. Bui. 1: 197. 1885. 



Nemacladus rigidus Curran var. rubescens Munz, Amer. 

 Jour. Bot. 11: 245. 1924 (in part). 



Western Mohave and Yuma Counties, 1,800 feet or lower, dry 

 gravelly or rocky soil in desert regions, mostly April to May. Nevada, 

 western Arizona, southern California, and Baja California. 



A well-marked species, easily distinguished from all others by the 

 silvery-gray stems and the smooth, yellowish-green, nearly entire 

 leaves. 



4. Nemacladus glanduliferus Jepson, Man. Fl. PI. Calif. 975. 1925. 



Nemacladus rigidus var. rubescens Munz, Amer. Jour. Bot. 

 11: 245. 1924 (in part). 



Throughout Arizona except the northeastern part (absent in Coco- 

 nino, Navajo, and Apache Counties), up to 5,000 feet, sandy deserts 

 and desert mountains, March to May. Southwestern Utah to southern 

 California, south to Sonora and Baja California. 



Represented in Arizona by var. orientalis McVaugh. This variety 

 is more widely distributed than any other member of the genus. 



4. LOBELIA 



Plants erect, more or less strict; inflorescence a single terminal 

 raceme (occasionally with subordinate lateral inflorescences) ; corolla 

 showy, strongly bilabiate; flowers inverted in anthesis, the pedicel 

 twisted. 



Many species of Lobelia have beautiful flowers and several of them 

 are grown as ornamentals. 



Key to the species 



1. Corolla normally blue; flower, when straightened, not more than 23 mm. long; 



filament tube 1.5 to 5.0 mm. long (2). 



2. Plant annual or biennial; filament tube 1.5 to 2.3 mm. long, the anthers all 



densely white-tufted at tip; corolla tube with slits in the sides in addition 



to the dorsal slit; leaves sharply serrate, broad and often clasping at 



base 1. L. fenestralis. 



2. Plant with a perennial rootstock; filament tube 3.5 to 5.0 mm. long, the 2 



smaller anthers white-tufted at tip, the 3 larger ones smooth or nearly 

 so; corolla tube entire except for the dorsal slit; cauline leaves shallowly 

 dentate or subentire, narrowed at base, never clasping. 



2. L. ANATTNA. 

 1. Corolla normally red, or red and yellow; flower when straightened 25 mm. long, 

 or longer; filament tube 18 to 35 mm. long (3). 



3. Pedicels elongate, 3 to 10 cm. long in fruit; anther tube 5 to 9 mm. long. 



3. L. LAXIFLORA 



3. Pedicels "short, seldom more than 1.5 cm. long in fruit; anther tube 3 to 4 

 mm. long 4. L. cardinalis. 



