1921] NATURAL SCIENCES OF PHILADELPHIA. 467 



Stem ascending-scabrous to glabrous. Leaves lan- 

 ceolate to filiform, entire or slightly lobed at base. 

 Pedicels 1 mm. long or more. Calyx-lobes linear to 

 subulate, slightly longer than to much shorter than 

 the tube. Anther-sacs of both pairs of stamens uni- 

 form. Capsule oblong to globose, 3-11 mm long. 

 Seeds closely reticulate. 25. Agalinis. 



Stem retrorse-hispid. Leaves lanceolate and usually 

 auricled at base, or bipihnatifid. Pedicels less than 

 1 mm. long. Calyx-lobes ovate, longer than the 

 tube. Anther-sacs of posterior stamens shorter. Cap- 

 sule ovate, 8-13 mm. long. Seeds reticulate with 

 raised ridges. 26. Otophylla. 



Corolla purple-blue or white, salverform, the tube very narrow 

 and densely pilose within, the lobes widely spreading. Sta- 

 mens each with but one anther-sac developed. Filaments 

 and style less than one half length of corolla-tube. Cap- 

 sule mostly or quite enclosed within calyx-tube. Pedicels 

 bibracteolate. 27. Buchnera. 



IX. Rhinantheae. 



Sepals five, all distinct, the posterior shorter than the others. 

 Pedicels bibracteolate. Capsule turgid, septicidal, only 

 ' tardily slightly loculicidally dehiscent. Seeds linear, 

 flat, 2 mm. long. 28. Schwalbea. 



Sepals four, those of each side united, the posterior one wanting. 

 Pedicels not bracted. Capsule flattened, loculicidal, 

 splitting even across the septum. Seeds turgid. 

 Corolla greenish to yellow distally, the posterior lobes pro- 

 jecting, not hooded at apex, the anterior lobes much 

 shorter and at least proximally somewhat thickened and 

 deep-green. Capsule cylindric, equally two-celled, in 

 dehiscence splitting on both posterior and anterior sides; 

 shorter than and enclosed within the calyx. Seeds many, 

 reticulate. Bracts foliaceous, usually distally yellow or 

 red. Leaves entire to pinnatifid-lobed. 



29. Castilleja. 

 Corolla yellow throughout, the posterior lobes arched, 

 hooded at apex, the anterior lobes well-developed, mem- 

 branous, thin, colored. Capsule ensiform, unequally 

 two-celled, splitting only on the posterior side; exserted 

 from and twice the length of the calyx. Seeds few, 

 not reticulate. Bracts not colored. Leaves bipinnatifid- 

 lobed. 30. Pedicularis. 



1. MECARDONIA Ruiz and Pavon. 

 Mecardonia R. and P., Syst. Veg. Fl. Peruv. et Chil. 164. 1798. 

 Type species, M. ovata Ruiz & Pavon, of Peru. 



