May, 1921] The Figworts of Ohio 219 



b. Fertile stamens only 2, rarely 4; corolla rotate, 

 salvcrform, tubular, or none. Veronice^. 



17. Leptandra. 18. Veronica. 19. Synthyris. 

 (2). Fertile stamens 4, ascending, their anthers enclosed 

 by the upper lip of the corolla. 



a. Cavities of the ovulary with several to numer- 



our ovules. Euphrasies. 



20. Pedicularis. 21. Castilleja. 



b. Cavities of the ovulary each with 1 or 2 ovules. 



22. Melampyntm. 

 B. Capsule usually opening by chinks or holes; corolla spurred or 

 prominently saccate, or with a palate in the throat, or decidedly 

 2-lipped, the lips broad and sack-shaped; upper lip of the corolla 

 covering the lower in the bud. ANTIRRHINAT^. 



1. Corolla tubular, prominently spurred or saccate, its throat 



usually closed by the palate; fertile stamens 4, a fifth, 

 minute, vestigial stamen sometimes present. 



Antirrhine^e. 

 23. Antirrhinum. 24. Linaria. 25. Chaenorrhimim. 



26. Kickxia. 27. Cymhalaria. 



2. Corolla 2-lipped, sack-shaped, or the lower one large and 



slipper-shaped; stamens only 2. Calceolarie.'e. 



28. Calceolaria. 



KEY TO THE GENERA. 



1. Anther-bearing stamens 5, the fifth smaller; corolla rotate; leaves alternate. 



Verbascum. 



1. Anther-bearing stamens 4 or 2 ; 2 



2. Anther-bearing stamens 4 3 



2. Anther-bearing stamens 2 23 



3. Corolla definitely spurred on the lower side 4 



3. Corolla not spurred, although it may be gibbous or saccate 7 



4. Flowers in terminal racemes; leaves narrow Linaria 



4. Flowers solitary in the axils 5 



5. Leaves linear-spatulate to linear; flowers blue or bluish; throat of the 



corolla not closed by the palate Chaenorrhimim 



5. Leaves broad, pinnately or palmately veined ; the throat of the corolla nearly 



or quite closed by the palate ; flowers yellowish, variegated, or lilac 6 



6. Leaves pinnately-veined, entire Kickxia 



G. Leaves palmately-veined, coarsely toothed; creeping vine Cymhalaria 



7. Trees with large, heart-shaped, opposite, entire leaves; violet, panicled 



flowers Paulownia 



7. Herbs 8 



8. Stamens not enclosed in the upper lip of the corolla, or apparently enclosed 



in the young condition, either included in the throat, exserted, or enfolded 

 by the lower petal; upper lip of the corolla not galeate, or if slightly so, 

 the vestigial stamen large 9 



8. Stamens ascending under the upper lip of the corolla; the corolla decidedly 



2-lipped, the upper lip galeate; the fifth stamen either minute or wanting. . 21 



9. Corolla decidedly saccate or gibbous on the lower side, with a prominent 



palate closing the throat; the fifth stamen very minute; leaves mostly 

 alternate, entire; upper lip of the corolla covering the lower in the 



bud A ntirrhinnni 



P. Corolla tubular or only slightly gibbous, without a palate; frequently with 



the fifth, sterile stamen prominent 10 



10. Fifth or sterile stamen prominent, either a filament, scale, or large gland; 



upper lip of the corolla covering the lower in the bud : .... 11 



10. Fifth stamen minute or wanting 14 



