IOWA ACADEMY OF SCIENCES. 137 



Tribe Antirrhine^, Leaves alternate or opposite; flowers racemose; 

 corolla tubular, spurred below. 



LiNARtA. Corolla with a Rlendcr spur; stamens 4; capsule opening near the summit. 



Tribe Chelone^. Leaves opposite; flowers in cymose o- umbel-like 

 clusters, often collectively paniculate; corolla tubular or irregular, 2-lipped, 

 not saccate or spurred; stamens 4 and a rudimentary fifth. 



ScROPHUtLARiA. Corolla sraall, globose, 4 of its lobes erect, the fifth reflexi'd, the 



fifth stamen a scale from the upper lip. 

 Pbntstemon. Corolla tubiilar; fifth stamen as lo:)g as the others; seeds angular, 



wingless. 

 Chelone. Calyx with three bracts at the base ; corolla tubular inflated ; fifth stamen 



shorter; seeds winged. 

 COLLINSIA. Corolla blue and white, 2-cleft, saccate above ; fifth stamen gland-like. 



Tribe Gratiole^. Leaves mostly opposite; flowers solitary, axillary; 

 stamens with anthers 2 — 4; fifth stamen wanting. 



MiMtTLUS. Leaves simple ; calyx 5 -angled, 5-toothed; corolla elongated; stamens 4. 



MoNNiEBA. Leaves simple ; calyx-segments unequal, the upper one largest; sta- 

 mens 4. 

 CONOBEA. Leaves pinnately parted ; calyx 5-parted; corolla short; stamens 4. 

 Gratiola. Leaves simple; stamens with anthers 2, the sterile short or wanting. 

 Ilysanthes. Leaves simple ; stamens with anthers 2, the sterile exserted. 



Suborder RHINANTHIDE^ Bejitham. 



Under lip or the lateral lobes covering the upper lip in the bud. 



Tribe Digitale^ Leaves alternate, opposite, verticillate or basal; 

 flowers racemose; calyx 4-parted; stamens 2 — 4; anthers 2 celled. 



Veronica. Leaves opposite; flowers solitary or racemose; corolla rotate, nearly 

 regular; stamens 2; capsule obcordate or emarginate, oompressed. 



Leptandra. Leaves verticillate, rarely opposite ; flowers in spike-like racemes ; cap- 

 sule ovoid, not compressed. 



WULFENIA. Leaves alternate and basal ; corolla campanulate, 2— 4-lobed, irregular; 

 stamens 2-4. 



Tribe Gerardie.^. Leaves opposite or the upper alternate; stamens 4, 

 in pairs; anthers 2-celled. 



Daststoma. Stamen-i didynamous, included ; corolla yello%v ; anthers awned at the 



base. 

 Gerardia. Stamens didynamous, included ; corolla pink or purple, rarely white ; 



anthers awnless. 

 Afzelia. Stamens nearly equal, scarcely if at all exserted. 



Tribe Euphrasie/E. Leaves alternate or opposite; flowers racemose or 

 spicate; corolla tubular, 2-lipped, upper lip arched or curved; stamens didyn- 

 amous. 



Castille.ja. Leaves alternate ; anther cells unequal, separate; capsule many-seeded. 



Pedicxtlaris. Leaves alternate or opposite; anther-cells equal, not separate; cap- 

 sule many-seeded. 



Melampyrum. Leaves opposite ; anther cells e(iual ; capjsules I— J-seeded. 



10 I AS 



