KEY. 191 



Calyx tubular. Upper lip of the corolla arched, triangular- 

 compressed, the margin folded back, the lower erect-spread- 

 ing and biconvex, 3-lobed at the apex. Floral leaves nearly 

 triangular, with 3 or 4 setaceous teeth at each edge, near the 

 base ; the rest of the leaves lanceolate or linear. Herb about 

 1 foot high. Melampyrum Amezicanum, Mx. 



(M. pratense, Wood.) 



473. Corolla deeply 2-lipped. Upper lip of the corolla 

 covering the lower in the bud (with occasional exceptions in 



Mimulus) 473 



Coi'oUa scarcely 2-lipped 480 



473. The rudiment of a 5th stamen present, or 2 of the 

 4 stamens with globular bodies imitating anthers 474 



No rudiment of a 5th stamen; the 4 stamens 

 always all fertile 477 



474. The outer pair of stamens sterile and exserted, 

 their forked filaments bearing either a glandular body, or 

 half an anther on one of the branches 451 



A rudiment of the 5th stamen present 475 



47d. The rudiment of the 5th stamen a filament 476 



The rudiment of the 5th stamen a scale, at the sum- 

 mit of the tube of the coi'oUa, the limb of which consists of 

 4 upper lobes and a lower lip. Stem 4-sided. Leaves oblong 

 or lanceolate, coarsely serrate, rounded or cordate at the 

 base. Flowers greenish-yellow, in a cymose panicle. 



Scrophularia nodosa, L. 



476. Seeds winged. Sterile filament shorter than the 

 rest. Calyx with 3 bractlets. Stem upright, branching. 

 Leaves lance-oblong, or lanceolate, short-petioled. Flowers 

 white, tinged with rose-color, in spikes, closely imbricated 

 with large, round-ovate, concave bracts and bractlets. Fila- 

 ments woolly. Chelone glabra, L. 

 Seeds angular. Sterile filament equalling the 

 regular stamens, and either naked or bearded. Stem 

 branched. Leaves lanceolate, ovate, or rounded, clasping. 

 Flowers purple, bluish, or white, in simple or compound 

 racemes. Feutstemou. 



