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



Key to the species 



1. Herbage densely woolly-tomentose throughout, not glandular; leaves all with 

 entire or obscurely crenate margins, those of the stem oblanceolate, 

 decurrent at base; flowers in long, thick, very dense spikes. 



1. V. THAPSUS. 



1. Herbage loosely pilose, glandular in the inflorescence; lower leaves with den- 

 tate-serrate margins, those of the stem lanceolate, clasping at base; flowers 

 in open, elongate, spikelike racemes 2. V. virgatum. 



1. Verbascum thapsus L., Sp. PL 177. 1753. 



Flagstaff and Walnut Canyon (Coconino County), Prescott (Yava- 

 pai County), Chiricahua Mountains (Cochise County), 5,000 to 7,000 

 feet, waste ground and roadsides, summer. Widely distributed in 

 North America; naturalized from Europe. 



2. Verbascum virgatum Stokes in Withering, Bot. Arrang. Veg. Brit. 



ed. 2, 1:227. 1787. 



Flagstaff (Coconino County), Chiricahua and Mule Mountains 

 (Cochise County), 6,000 to 7,000 feet, waste land, late summer and 

 fall. Here and there in North America; adventive from Europe. 



2. LINARIA. Toadflax 



Plants herbaceous, glabrous or nearly so, flaxlike in habit and foliage ; 

 flowering stems erect, simple or few-branched, leafy; leaves sessile, 

 narrow, entire; flowers in terminal racemes; corolla strongly bilabiate, 

 with a long slender basal spur (this rarely obsolete) , and a prominent 

 palate in the throat; capsule opening near the apex by pores or chinks. 



Key to the species 



1. Plant perennial; racemes dense; corolla yellow with an orange-colored palate, 

 25 to 30 mm. long; seeds winged 1. L. vulgaris. 



1. Plant annual or biennial, with short sterile basal shoots; racemes slender, 

 becoming elongate; corolla bright blue, not more than 10 mm. long; seeds 

 wingless 2. L. canadensis. 



1. Linaria vulgaris Mill, Gard. Diet. ed. 8, no. 1. 1768. 

 Flagstaff, Coconino County (Deaver 909). Widely distributed in 



waste ground in North America; naturalized from Eurasia. 

 Common toadflax, often called butter-and-eggs. 



2. Linaria canadensis (L.) Du Mont de Cours, Bot. Cult. 2: 96. 



1802. 



Antirrhinum canadense L., Sp. PL 618. 1753. 



Graham, Gila, Maricopa, Pinal, Cochise, and Pima Counties, 1,300 

 to 5,200 feet, plains and mesas, February to May. Throughout most 

 of North America ; South America. 



Represented in Arizona by var. texana (Scheele) Pennell {L. texana 

 Scheele) , a relatively large-flowered form. 



3. MOHAVEA 



Plants annual, viscid-villous ; leaves alternate, petioled, the blades 

 narrowly to broadly lanceolate, entire; flowers in leafy spikes or 

 racemes; corolla pale or bright yellow, with a short tube and an ample 

 limb, the lower lip with a relatively small palate, spotted with red or 

 purple. 



