28'^ FLORA OF PHILADELPHIA. 



Sterile stamen elongated, longer or shorter than the others. 

 Corolla tubular, 2-lipped, the lobes of the lower lip flat. 

 Sterile stamen shorter than the others; seeds winged. 



6. Chelone. 

 Sterile stamen about equalling the others; seeds wingless. 



7. Pentstemon. 

 Corolla 2-eleft, declined ; middle lobe of the lower lip conduplicate. 



8. Collinsia. 



Stamens 4, all anther-bearing, or 2 sterile, or 2 only. 

 Stamens 4, all anther-bearing ; corolla 2-lipped ; stamens not enclosed 



in upper lip of corolla. 9. Mimulus. 



Stamens 4, 2 anther-bearing and 2 sterile, or 2 only; corolla obviously 

 2-lipped. 

 Calyx 5-parted; upper lip of corolla present. 



Sterile filaments short or none. 10. Gratiola. 



Sterile filaments slender, 2-lobed. 11. Ilf/santhes. 



Calyx 4-toothed ; upper lip of corolla obsolete ; low mud plant. 



12. Micranthemum. 

 Stamens 4, all anther-bearing; corolla nearly regular; flowers on scapes, 



13. Limosella. 

 Stamens 2 only; corolla rotate, salverform, tubular or none. 



Corolla rotate ; capsule obcordate or emarginate, compressed. 



14. Veronica. 

 Corolla tubular-funnelform ; capsule ovoid, not compressed. 



15. Leptandra. 

 Stamens 4, all anther-bearing; corolla campanulate, salverform or fun- 



nelform, scarcely 2-lipped. 

 Corolla salverform ; flowers in a long spike. 16. Bucknera. 

 Corolla campanulate or funnelform. 



Anthers awned at the base; corolla yellow. 17. Dasystonia. 

 Anthers awnless ; corolla purple, pink or rarely white. 



]8. Gerardia. 

 Stamens 4, all anther-bearing, ascending under the upper lip of the 

 corolla. 

 Ovules several or numerous ; capsule many-seeded. 



Anther-sacs dissimilar, the inner one pendulous by its apex; 

 leaves mostly alternate. 19. Castilleja. 



"*"'•' Anther-sacs similar and parallel; leaves mostly opposite. 



Calyx 2-bracteolate at the base, 5-toothed. 



20. Schwalbea. 

 Calyx not bracteolate, 4-5-toothed, or cleft or split. 



21. Pedicularis. 

 Ovules only 1 or 2 in each cell of the ovary; capsule 1-4-seeded; 



leaves opposite. 22. Melampyrum. 



1. VERBASCUM L. Mullein. 



Plants densely woolly; flowers in dense terminal spikes or spike-like racemes. 



1. F. Thapsus. 

 Leaves whit«-tomentose beneath; flowers in large terminal panicles. 



2. V. Lychnitis. 

 Plant glabrous or sparingly glandular ; flowers racemose. 3. V. Blattaria. 



1. Verbascum Thapsus L. Common Mulleiii. M. p. 819. Fields and 



waste places. Summer. 



2. Verbascum Lychnitis L. White Mullein. M. p. 820. Fields and waste 



places. Summer. 

 Philadelphia— Falls of Schuylkill, Mart. (B. C), Walnut Lane Station 

 (Je.), East Fairmount Park (Le.), near Bartram 's Garden (Mac), Ger- 



