KEY TO THE FAMILIES AND GENERA 



113 



8. Gratiola Tribe. 



A. Perfect stamens 2 26. Gratiola. 



AA. Perfect stamens 4. 



B. Stamens all affixed inside corolla-tube. 



c. Calyx bell-shaped, 5-parted 27. Afazus. 



cc. Calyx tubular, 5-toothed and -angled 28. Mimulus, 



BB. Stamens partly inside corolla-tube, partly 



in throat, 2 affixed in each place 29. Torenia, 



9. Digitalis Tribe, 



A. Caps, opens by loculicidal valves. 



B. Herbs creeping 30. Sibthorpia. 



BB. Herbs upright 31. Rehmannia. 



BBB. Herbs thick-rhizomatous, the Ivs. nearly or 



quite radical 32. Wulfenia. 



AA. Caps, opens by septicidal valves. 

 B. Lvs. alternate. 



c. Corolla dcclinate, tube swollen, or bell- 

 shaped; posterior lip spreading 33. Digitalis. 



cc. Corolla-tube slender, spreading 34. Erinus. 



BB. Lvs. opposite 35. Ourisia. 



AA,.\. Caps. 4-valved or locuUcidally 2-valve(i. 



B. Lvs. all alternate or radical 36. Synthyris. 



BB. Lvs. (at least lower ones) opposite 37. Veronica. 



10. Gerardia Tribe. 



Calyi-lobea shorter than tube 38. Gerardia. 



11. Euphrasia Tribe. 



A. The anther-cells equal 39. Pedicularis. 



AA. The outer anther-cell fixed by the middle; 

 inner one pendulous or deficient. 

 B. Calyx laterally compressed, split on ante- 

 rior side or both 40. Castilleia. 



BB. Calyx 4-cut 41. Orthocarpus. 



Other genera to be looked for are: Bowkeria, Craterostigma, 

 Herpcstis, Lindenbergia, Seymeria. 



133. LENTIBULARIACE.^;. 



A. Posterior Up of corolla erect; calyx 2-parted or 



deeply 2-lobed 1. Utricularia. 



AA. Posterior Up of corolla spreading; calyx 4-5- 



parted 2. Pinguicida, 



134. BIGNONIACE.^. 



I. Ovary 2-celled: caps, dehiscent: lvs. mostly 

 opposite. 

 B. Valves opening parallel with septum. 



C. Lvs. 2-3-foUolate: shrubs, climbing with 

 tendrils. 

 D. Tendrils fiUform, simple. 

 E. Disk present. 



F. Caps, smooth or sUghtly warty, 

 broadly Unear: calyx with black 



glands 1. Adeno- 



FF. Caps, rough, broad: disk crenate; [calymma. 

 calyx not glandular, with 5 



subulate teeth 2. Clytostoma. 



EE. Disk wanting; calyx with 5 short 



teeth or truncate: caps. Unear 3. Cydista. 



DD. Tendrils 3-parted, fiUform, slender. 

 E. CoroUa straight or .slightly curved, 

 membranous : caps, narrow, smooth. 

 F. Lobes of corolla imbricate; sta- 

 mens inclosed: tendrils twice or 



thrice 3-parted 4. Anisostichus. 



(See under Bignonia.) 

 FF. Lobes valvate; stamens exserted: 



tendrils simply 3-parted 5. Pyrostegia. 



EE. Corolla strongly curved; calyx 

 leathery, tomentose. 

 F. Stamens inclosed; fls. white. 



G. Ovary warty: caps. broad, 

 rough, not curved: branches 



angular 6. Pithecoc' 



GO. Ovary smooth: caps, oblong, [tenium. 

 cun-ed, with a convex and a 

 concave valve: branches ter- 

 ete 7. Distictia. 



FF. Stamens ex.serted; fls. red; ovary 



tomentose 8. Pka;dran- 



DDD. Tendrils 3-parted, the ramifications [thus. 



hooked, claw-like. 

 E. Calyx truncate orlobed;disk simple. 9. Bignonia. 

 EE. Calyx splitting on one aide; disk 



double 10. Macfady- 



[enia. 



cc. Lvs. 2-3-pinnate: upright tree 11. Oroxylon. 



BB. Valves opening at right angles to septum: 

 upright plants or cUmbing without tendrils. 



8 



c. Habit climbing (upright in some forms of 

 Campsis); Ivs. pinnate. 



D. Stamens exserted: Ifts. serrate 12. Tecomarm. 



DD. Stamens inclosed. 



E. CUmbing by rootlets: Ifts. serrate: 



corolla campanulate-funnelform. . .13. Campsis. 

 EE. CUmbing without rootlets: Ifts. 

 entire. 

 F. Corolla club-shaped, straight, up- 

 right; fls. in racemes 14. Campsidium 



FF. Corolla campanulate-funnelform; 



fls. in panicles 15. Pandorea. 



cc. Habit upright: herbs, with alternate lvs.: 

 caps, folliculately dehiscent. 

 D. Seeds with membranous wing: lvs. 



simple or compound 16. IncarvUlea. 



DD. Seeds with fringed hairs, lvs. pinnate. 17. Amphicome, 

 ccc. Habit upright: trees or shrubs with usu- 

 ally opposite lvs. 

 D. Lvs. simple or digitate. 



E. Seeds fringed with hairs: lvs. simple, 

 entire. 

 F. FertUe stamens 4: lvs. linear, alter- 

 nate 18. Chilopsis. 



FF. FertUe stamens 2: lvs. cordate, 



opposite 19. Catalpa. 



EE. Seeds winged : lvs. simple or digitate . 20. Tabebtiia. 

 DD. Lvs. pinnate, rarely simple and serrate. 

 E. Septum flat. 



F. Calyx campanulate, truncate, 

 toothed or lobed. 

 G. Staminode not elongated. 



H. Anthers with enlarged leafy 

 connective; calyx regularly 

 5-toothed: shrubs: Ifts. 

 serrate; lvs. rarely simple. . .21. Tecojna, 

 HH. Anthers without enlarged con- 

 nective; calyx irregularly 

 2-5-lobed: tree: Ifts. usually 



entire 22. Hetero- 



GG. Staminode much elongated and [phragma, 



enlarged at the apex: calyx 

 small; fls. in large terminal 

 panicles; lvs. 1-2-pinnate with 



numerous Ifts 23. Jacaranda. 



FF. Calyx spathe-Uke, splitting on one 

 side; corolla broadly campanu- 

 late 24. Spathodea, 



EE. Septum thick, spongy. 



F. Seeds in deep impressions of the 

 septum: calyx truncate or in- 

 distinctly toothed: lvs. usually 



bipinnate 25. Rader- 



PF. Seeds in shallow impressions of [machiat 



the septum: calyx 3-5-lobed: 



lvs. pinnate 26. Stereospev' 



AA. Ovary 1-celled. [mum, 



B. Fr. a dehiscent caps. : corolla tubular, nar- 

 rowed at the mouth: lvs. opposite, pinnate: 



climbing with tendrils 27. EccremO' 



BB. Fr. indehiscent: corolla campanulate or [carpus, 



campanulate-funnelform: trees or shrubs, 

 with alternate lvs. 

 c. Lvs. simple or 3-foHolate. 



D. Calyx spathe-Uke, splitting on one side; 



corolla regular; fls. on the old wood. .28. Parm^ntiera, 

 DD. Calyx campanulate, irregularly lobed; 

 corolla very irregular; fls. at the end 



of the branches 29. Crescentia. 



cc. Lvs. pinnate: coroUa irregular 30. Kigelia. 



The genus Colea is also more or less in cultivation ivithin our limits. 



135. GESNERIACE.ffi;. 



A. Ovary more or less inferior: fr. capsular, 



B. Disk 1. Niphsea. 



BB. Disk annular. 



c. Fls. smallish, palUd or white 2. Dicyrta. 



cc. Fls. largish, variously colored. 



D. CoroUa-tube broadly swollen or bell- 

 shaped; calyx-lobes usually membra- 

 nous or leafy 3. Gloxinia. 



(Of botanists, not of florista.) 

 DD. Corolla-tube cylindrical or broad- 

 ened above; calyx-lobea narrow or 

 short. 



E. The fls. axillary 4. Ackimenes. 



(Consult also Scheeria.) 

 EE. The fls. alternate in a terminal, leaf- 

 less raceme 5. Nsegelia. 



BBB. Disk of 5 distinct or but slightly united 

 glands, these equal or unequal. 

 c. Caps, inferior to the middle or higher. 



D. Anther-cells confluent at apex 6. Sinningia. 



(Gloxinia of florists.) 



DD. Anther-cells distinct 7. Isoloma. 



cc. Caps, shortly immersed at base, almost 



superior 8. Gesneria, 



