502 SCROPHULARIACEX 
* Calyx prismatic and barely 5-toothed, or rarely campanulate and 
hardly 5-cleft: corolla more or less bilabiate: stamens four. 
10 Diplacus Shrubby perennials: capsule firm-coriaceous, narrow and 
closely invested by the calyx, tardily dehiscent down the upper suture. 
11 Eunanus Low annuals: capsule from almost bony and indehiscent to 
membranaceous. 
12 Mimulus Annual or perennial herbs, capsule membranceous tardily 
separating from the central placentiferous column. 
* * Calyx 5-parted or deeply 4-5-lobed : antheriferous stamens only 
2, the posterior pair, the anterior pair sterile rudiments or wanting. 
18 Gratiola Sterile filaments none, or short and entire, 
I4 Ilysanthes Sterile filaments present, slender and forked. 
* * * Calyx and corolla both 5-lobed and nearly regular: antherif- 
erous stamens 4, nearly equal. 
15 Limosella Small plants with the flowers on scapes. 
III Leaves various. Lower, lip or lateral lobes of the co- 
rolla external in the bud. 
TRIBE v_ Corolla usually little if at all bilabiate, the lobes all 
plain, the lateral or one of them external in the hud. 
* Stamens 2, distinct, exserted; filaments straight, inserted at or 
eggs mp sinuses between the two lateral and the posterior lobe of 
the corolla. 
16 Synthyris Corolla from oblong to short-campanulate. 
17. Veronica Corolla from rotate with very short tube to salverform, 
* * Stamens 4, distinct, not exserted, inserted on the upper side of 
the tube of the corolla 
18 Diairatis Corolla tubular-funnelform, somewhat irregular. 
TRIBE vI Corolla manifestly bilabiate, the upper lip erect and 
concave or galeate, entire or emarginate, rarely 2-cleft, the lower 
3-cleft, exterior in the bud. 
* Ovules and usually the seeds numerous. 
+  Anther-cells unequal or dissimilar, the outer one™affixed by its 
middle, the other pendulous from its upper end, mostly smaller, some- 
times sterile. 
19 Castilleia Upper lip of the corolla much longer than the very short 
and 3-toothed lower one. 
20 Orthocarpus Upper lip of the corolla scarcely longer and usually 
narrower than the inflated 1-3-saccate lower one. 
21 Adenostegia Upper lip of the corolla not longer nor much if any 
narrower than the 3-crenulate or entire lower one. 
+ + Anther-cells equal, parallel and alike in all 4 stamens. 
22 Pedicularis Calyx split anteriorly, not inflated in fruit. 
23 Ruinantaus Calyx 4-toothed, inflated in fruit. 
* * Ovules only twoin each cell, one sessile and ascending, the 
other laterally attached. 
