1921] NATURAL SCIENCES OF PHILADELPHIA. 501 



Nueces and Webb counties; lower Sonoran zone. Ranges from 

 southern Texas and Arizona to southern Mexico. 



Texas. Bexar: Comanche Spring; San Antonio, Pennell 5472 

 (P, Y) . Gillespie : Threadgill, Jermy 487 (U) . Hays : San Marcos, 

 Pennell 10428 (A, Y). Nueces: Corpus Christi, Heller 1790 

 (A, U, Y). Travis: Austin, Pennell 10451 (Y); Barton Springs. 

 Webb: Laredo, Letterman 35 (Y). 



19. LINARIA Miller. 

 Linaria Mill., Gard. Diet. ed. IV. 1754. 

 Type species, Antirrhinum linaria L., of Europe. 

 Corolla, excluding spur, 4-12 mm. long, blue; posterior lip erect; 

 anterior lip broadly spreading, but not forming a definite 

 raised palate; spur slender. Capsule 2-3.5 mm. long, equal- 

 ing to slightly exceeding the sepals. Seeds .3-.4 mm. long, 

 cylindric, prismatic-angled, not winged. Stem less leafy, the 

 younger stems spreading-prostrate from base. 



(Leptoplectron.) 

 Surfaces of seeds smooth to slightly tuberculate, the angles thin. 

 Corolla less than 48 mm. long, excluding the spur which is 2-6 

 ipm. long. 1. L. canadensis. 



Surfaces and rounded angles of seed densely tuberculate. Cor- 

 olla over 10 mm. long, excluding the spur which is 5-9 mm. long. 



la. L. canadensis texana. 

 Corolla, excluding spur, 15-18 mm. long, yellow; posterior lip arched 

 over anterior; anterior lip forming a conspicuous protruding 

 orange palate, spur stout. Capsule 10 mm. long, much exceed- 

 ing the sepals. Seeds 1-7 mm. long, flattened and circularly 

 broadly- winged. Stem densely leafy, always erect. 



2. L. linaria. 



1. Linaria canadensis (L.) Dum.-Cours. 



Antirrhinum canadenseL., Sp. PI. 618. 1753. "Habitat in Virginia, Can- 

 ada." Type probably from southern New Jersey, and certainly the species 

 now considered. For discussion see Torreya 19: 151. 1919. 

 Linaria canadensis Dum.-Cours., Bot. Cult. 2: 96. 1802. "Lieu, Le Can- 

 ada, la Virginie." Doubtless based upon Antirrhinum canadense L. 



Corolla purplish-blue, the palate paler. Flowering from March 

 to May, and soon ripening fruit. 



Open sandy soil, usually a weed, eastward, chiefly in the Coastal 

 Plain; less frequent than the following, with which it intergrades. 

 Ranges through the Atlantic Coastal Plain, from Massachusetts 

 to Florida and Texas; inland probably introduced. 



Arkansas. Pope: Russellville, Pennell 10636 (Y). 



Louisiana. Rapides: Alexandria, Hale (A, U, Y). 



