KEY TO THE FAMILIES AND GENERA 



111 



cc. Lvs. opposite. 



D. Corolla bell-shaped, with 5 squamellje 



alternating with stamens , 16. Apocynum. 



DD. Corolla salver-shaped or funnel-shaped, 

 the throat without scales. 



E. Disk of 2 scales 17. Dipladenia, 



EE. Disk many-toothed or crenulate 18. Odontadenia. 



EEE. Disk of o lobes or scales, often trun- 

 cate in Trachelospermum. 

 F. Fls. salver-shaped. 



G. Infl. lax corymbose cymes 19. Trachelos* 



GG. Infl. racemose; rarely shortly [permum. 



dichotamous 20. Echites. 



FF. Fls. funnel-shaped. 



G. In cymes 21. Beaumontia. 



GG. In racemes 22. Mandevilla. 



Other genera treated are: Hunteria, Landolphia, Pachypodium. 

 Parsonsia, Pleiocarpa and Strophanthus. 



126. POLEMONIACE.E. 



A. Caps, deeply locuhcidal: herbs or sub-shrubs. 

 B. Stamens unequally affixed to corolla-tube; 

 not declinate . 



c. Lvs. mostly opposite, entire 1. Phlox. 



cc. Lvs. mostly alternate, usually incised or 



pinnatifid 2. Collomia. 



BB. Stamens equally affixed to lube or throat. 



c. The stamens not declinate 3. Gilin. 



cc. The stamens declinate. 



D. Filaments pilose-appendaged at base. . . 4. Polemo- 



\ Ilium. 



DD. Filaments not appendaged 5. Laeselia. 



A A. Caps, short ly locuUcidal at apex ; seeds 



broadly winged : trees or shrubs 6. Canttta, 



AAA. Caps, deeply septicidal: tall climbers 7. Cobsea. 



127. HYDROPHYLLACEiE. 



A. Styles 2, distinct from baae; corolla-lobes im- 

 bricate 1. Wigandia, 



AA. Styles 2-cut, rarely undivided. 

 B. Corolla-lobes usually convolute. 



c. Stamens exserted 2. Hydrophyl- 



[lum. 



cc. Stamens included 3. Nemophila. 



BB. Corolla-lobes imbricated. 



C. Fls. marcescent, bell-shaped 4. Emmenan- 



cc. Fls. deciduous. [the. 



D. The peduncles 1-fld 5. Hespero- 



[chiron. 

 DD. The fls. cymose or in 1-sided racemes. . . 6. Phacelia. 



128. BORAGINACEiE. 



A. Ch'ary undi\'ided {or only laterally 4- 

 lobed) and surmounted by the style. 

 B. Style twice bifid; stigmas not an- 

 nular; cotyledons plaited or cor- 

 rugated 1. CoRDiA Tribe. 



BB. Style once bifid or 2-parted (the 

 divisions sometimes coalescent to 

 the top) ; stigmas more or less capi- 

 tate; cotyledons plane 2. Ehretia Tribe. 



BBB. Style entire, sometimes wanting; 

 stigina shield- or ring-shaped, 

 forming a complete ring sur- 

 mounted usually by a tip or ap- 

 pendage which is entire or 2-lobed 

 and varies from hemispherical to 



subulate 3. Heliotrope 



\\. Ovary 4-parted (rarely 2-parted) from (Tribe. 



above into 1-celled, 1-ovuled divisions 

 surrounding the base of the undivided 

 (rarely 2-lobed) style; stigma not 

 annular 4. Borage Tribe. 



1. Cordia Tribe. 



Calyx tubular or bell-shaped, merely toothed or 



lobed 1. Cordia. 



2. Ehretia Tribe. 



Calyx 5-parted; style 2-fid 2. Ehretia. 



3. Heliotrope Tribe. 



A. Plants sarraentose or twining 3. Tourne' 



l/orlia. 



AA. Plants are herbs or sub-shrubs 4. Heliotro- 



[pium. 



4. Borage Tribe. 



A. Gynobase elevated. 



B. Apex of nutlets not projecting much beyond 

 scar. 

 c. Nutlets divergent or divaricate (either 

 radiately or in pairs), extended out- 

 ward or backward much beyond the 

 insertion (which is by a roundish or 

 oblong scar); gynobase little elevated 

 or broadly conical. 

 D. Stamens included. 



e. Nutlets covered with small cups or 



cavities 5. Omphalodes. 



EE. Nutlets covered with small warta or 



barbed bristles 6. Cynoglos- 



DD. Stamens exserted. \sum. 



E. Corolla-tube longer than spreading 



lobes 7. Lindelofia. 



EE. Corolla tubular; lobes short, erect or 



somewhat spreading 8. SolenatUhus, 



cc. Nutlets adnate by tlie inner face or keel 

 to an elevated, conical or columnar 

 g3mobase, forming a more or less glo- 

 bose or pyramidal fruit 9. Myosotid- 



BB. Apex of nutlets projecting conspicuously [ium^ 



beyond scar. 

 C. Pedicels persistent. 



D. Nutlets keeled toward apex 10. Plagiobolrys* 



DD. Nutlets not keeled 11. Oreocarya. 



CC. Pedicels deciduous 12. Crypianthe. 



AA. Gynobase flat or nearly so. 



B. Scar excavated or often girt by a ring, 

 c. Throat of corolla has 5 scales inside. 



D. Filaments appendaged with a scale 13. Borago. 



DD. Filaments not appendaged. 



E. Corolla-lobes very short and sub- 

 erect 14. Symphytum, 



EE. Corolla-lobes spreading 15. Anchusa. 



cc. Throat naked or pilose 16. Pulmonaria. 



BB. Scar flat, either small at the inner angle or 

 oblique. 

 c. Racemes without bracts (rarely a few 

 bracts at base); anthers obtuse at apex. 



D. Throat of corolla scaly 17. Myosotis. 



DD. Throat almost naked 18. Merteiisia. 



cc. Racemes bracted. 



D. Anthers obtuse at apex or hardly 

 mucronate. 



E. Lobes of corolla erect 19. Onosmo- 



EE. Lobes of corolla spreading. \dium. 



F. Corolla-tube cylindrical; throat 

 naked or 5-gibbous and sub- 



quamate 20. Lithosper- 



FF. Corolla-tube slender; throat [m u m. 



naked 21. Arnebia. 



FFF. Corolla tubular or salver-form; 

 throat naked, lobes usually un- 

 equal 22. Echium, 



DD. Anthers linear, often acuminate, arrow- 

 shaped at base. 



E. Nut lets distinct 23. Onosma. 



EE. Nutlets connate in pairs 24. Cerinthe. 



129. CONVOLVULACE^. 



A. Corolla-lobes small, imbricate: plants para- 

 sitic, leafless: sts. thread-like, not green 1. Cuscuta. 



AA. Corolla large, phcate or induplicate in sestiva- 

 tion. 

 B. Fr. berry-like or harder, indehiscent: style 

 undivided. 



c. The ovary 4-eelled, 4-o\'uled 2. Argyrela. 



cc. The ovary 2-celled, 4-o\'uled 3. Lettsomia. 



BB. Fr. a 2— 4-valved caps, with a thin or hard 

 pericarp, or indehiscent with a thin peri- 

 carp: styles 2 and distinct or the style 

 entire or divided. 

 c. Stigma capitate; style entire or 2-parted; 



ovary 2-celled, 4-ovuled 4. Parana. 



cc. Stigma thick, globose, often twin; ovary 

 2-4-celled, 4-oviiled. 

 D. Stamens and style included within the 



corolla-tube 5. Ipomcea. 



DD. Stamens and style exserted. 



E. Plant a night-bloomer: corolla con- 

 torted in bud 6. Calonyctiun. 



EE. Plant a day-bloomer: corolla not 



contorted 7. Quamoclit. 



ccc. Stigma capitate; ovary 2-ceUed 8. Breweria. 



cccc. Stigmas 2, linear, filiform or thickish 9. Convolrulus, 



lExcept Calystegia section. 

 See also Rhodorhiza.) 



ccccc. Stigmas 2, fiat, ovate or oblong 10. Jacguemoii' 



[tia, 

 (Also Calystegia section of Convolvulus.) 



