no 



KEY T(^ TTIK FAMILIES AND CENERA 



B. Ft. R drupe: endocarp hard, thick or thin: 



infl. axilUr>*. rarely ttTiuinal 10. Olea. 



SB. Ft. a lx*rn,'. hHn.il}' drupaceous; endocarp 

 membranous or thinly coriaceous: pani- 

 cles terminal 11- Uoustrum. 



122. LOGANIACE^. 



A. Style 2-fid. branches linear. 2-fid 1. Gehemium. 



AA, Ptylc simple. 



B. CoroUa-lobcs valvate. 



c. Kr. a circumscissile caps 2. Spigelia. 



ct*. Fr. an tndehiscent drupe or berry 3. Strychnos. 



BE. Corolla-lol>OM imbricate. 



c. Anthers exserted 4. Cfiilianthus. 



cc. Anthers included o. Bud^lUin. 



The genus Logania may afford cultivated plants now and then. 



123. GENTIANACEjE. 



A. Lvs. alternate or radical. 



B. Fr. indehiscent 1. Symphoides. 



BB. Fr. dehiscent. 



c. Caps, usually 4-valved at apex 2. Villamia. 



cc. Caps, irrcpularly sub-2-valved at apex. . . . 3. Menynnthes. 

 AA. Lvs. opposite. 



B. Ovary perfectly 2-cellcd; placenta soHtary 

 in each cell, often thick, adnate to septum; 



liberated by dehiscence of caps 4. Exaciim. 



BB. Ovary 1-cclled; placentiferous margins of 

 carpels more or les8 intruded within or 

 even touching but not connate in the mid- 

 dle of the cell, spuriously 2-celled. 

 c. Style often deciduous; anthers usually 

 erect. 



D. Anthers spirally twisted finally 5. Erythrna. 



DD. Anthers finally recurved at apex 6. Sahhatia. 



CC. Style usually persistent; anthers versa- 

 tile, finally recurved 7. Lisianthus. 



BBB. Ovary l-celled; margins of carpels rarely 

 intruded; ovules and seeds affixed at 

 each side of the suture in 1 series or more 

 or less extended over the parietal surface; 

 piacentffi adnate. very thin. 

 C. Corolla has 1-2 pits at base of each lobe. 



D. Style short or scarcely any 8. Swertia. 



DD. Style subulate 9. Frai<era. 



cc. Corolla has no such pits 10, Centiana. 



The genus Chironia may also be expected in cultivation. 



124. ASCLEPIADACEiE, 



Subfamily 1. PERIPLOCE.^. Pollen granular, loosely aggre- 

 gated in 2 masses in each anther-cell. 



Character of subfamily 1. Peripixha Tribe. 



Subfamily 2. EUASCLEPIADEiE. Pollen waxy, the masses 

 solitary in each anther-cell. 



Anthers tipped by a membrane, which is 



inflexed or «tometimes erect, and usually 



hyaline, rarely opaque or petal-hke; 



pollen-ma-sses suspended, attached in 



pairs (1 in each adjacent cell of different 



anthers) to the corpuscle or gland 2. CvnanchumTribe. 



Anthers usually tipped by an inflexed or 



suberect membrane, which is hyaUne, 



rarely oparjue; pollinia solitary in each 



ceil, erect or very small 3. Marsdknia 



Anthers obtuse at apex, not appendaged (Tiube. 



or rarely the connective produced; pol- 

 linia solitary in the cells, erect 4. Ceropkgia Tribe. 



Anthers like those of the CeropegieEe or 



more incumbent above the top of the 



ftti^ma or subimmersed: sts. thick and 



fleshy, leafless or with a few lvs. at toj). . 5. Stapelia Tribe. 

 Anthers broad at the top, without ap- 

 pendages or more or less membranaett- 



oiift on the margins, the cells somewhat 



transversely dehiscent, atlac hed 



nearly or quite on the margin of the 



stigma-flisk ; pollinia horizontal or 



essentially so G. Gonolobus Tribe. 



1. Periploca Tribe. 



A* Scalea of corona distant from staminal tube. 

 B. Corolla-tube short; scalea linear or club- 

 shaped _. 1. CryptoUpia. 



BB. Corolla large, funnel-shaped; scales acumi- 

 nate or 2-fid 2. Cryptofttegia. 



AA. .SealcH of corona close to stamens. 



B. CorolIa-lob*;H valvate 3. Chloror.odon. 



BB. Corolla-lobes imbricate 4. i'eriploca. 



2. Cynanchum Tribe. 



A. The outer or single crown either simple and 

 composed of ^ scales or rinn-shuped, adnate 

 to the corolla and not the staminal tube, or 

 rarely adherent to both. 



B. Stigma depressed 5. Mncroscepis. 



BB. St igma umbonat e or 2-beaked at apex : 

 corona-scales attached at middle (or 



below t of corolla-tube fi. Physianthus. 



BBB. Stigma plane or umbonate; corona annular, 



adnate to corolla 7. Philibertia. 



AA. The crown of 5 scales affixed to base of 

 corolla and staminal tube; caudicles of pol- 

 linia appendaged with an erect fuscous 



tooth 8. Oj-ypetalum, 



AAA. The crown of 5 scales which are distinct, 

 affixed or adnate to the staminal tube or 

 the back of the anthers. 

 B. Scalea concave or hooded with an acute 



ligula inside 9. Asclepias: 



BB. Scalea fleshy, narrow, adnate to stamen- 

 tube, but free and recurved at base. ...... 10. Calotropis. 



BBB. Scales (5 outer ones) carinate-compHcate 



at base of staminal tube; the 5 scales at 



the apex of ihc Inrin staminal tube, short, 



obtuse, sprl)^(lin^:. alternate with anthers..ll. Podostigma. 



AAAA. The outer or single crown affixed to the 



staminal tube, ring- or cup-shaped, entire, 



lobed or parted. 



B. Corona villous inside 12. Morrenia. 



BB. Corona with 5 scales or ligulee inside 13. Cynanchum. 



BBB. Corona naked inside 14. Vincetoxi- 



BBBB. Corona of 5 short processed oppoaite anthers [cum. 



and 10 ligulse alternate with anthers in 

 pairs 15. Rothrockia. 



3. Marsdenia Tribe. 



A. Corolla-lobes strictly valvate 16. Hoya. 



AA. Corolla-lobes usually overlapping dextrorsely. 

 B. Fls. not pure white, urn- or salver-shaped, 



small or medium-sized 17. Marsdenia. 



BB. Fls. white, salver- or funnel-shaped, large. . . 18. Stephanotis. 



4. Ceropegia Tribe. 



Corona double, affixed to staminal tube 19. Ceropegia. 



5. Stapelia Tribe. 



Corona double, outer spreading, inner of 5 scales. 20. Stapelia. 



6. Gonolobus Tribe. 

 Crown cup-shaped or annular, entire or lobed. . 



.21. Gonolobus. 



Additional genera described in Asclepiadacese are: Caralluma, 

 Duvalia, Echidnopsis, Gomphocarpus, Hoodia, Huernia, Michu- 

 litzia, Pectinaria, Piaranthus, Raphionacme, Sphaerocodon and 

 Trichocaulon. 



125. APOCYNACE^. 



A. Anther-cells not appendaged at base. 

 B. Ovary entire (Carissa Tribe); fls. 5-merous. 



c. Fr. a 2-valved caps.: ovary l-celled 1. AUamanda. 



cc. Fr. a berry, indehiscent: ovary 2-celled; 

 cells 1-4-ovuled. 

 D. Ovules laterly affixed: cymes ter- 

 minal, few-fld: .spines axillary 2. Carissa. 



DD. Ovules erect from ba.se: cymes axillary, 



dense: spines 3. Acukanthera. 



BB. Ovaries 2 to several ; style 1 (Plumeria Tribe). 

 c. Calyx with several glands inside or a ring 

 of hairs. 



D. Carpels 2-ovuled 4. Theietia. 



DD. Carpels many-ovuled 5. Taberna'- 



cc. Calyx without glands inside. [montana. 



D. Carpels 2-ovuIed. 



E. Disk 2-scaled 6. Kopsia. 



EE. Disk cup-shaped or annular 7. Kauimlfia. 



DD, Carpels 0- to many-ovuled. 

 E. Ovules in 2 series. 

 F. Disk 0. 



G. Sec<ls truncate 8. Amsonia. 



GO. Seeds winged 9. Gonioma. 



FF. Disk of 2 scales 10. Vinca. 



EE. Ovules in many series. 



F. Stamens near base of tube 11. Plumeria. 



FF. Stamens above middle of tube 12. .1 Islon ia. 



AA. Anther-cells produced at base. (Echites 

 Tribe.) 

 B. The cone of anthers more or less exserted 

 at apex. 



c. Throat of corolla with 5 scales 13. Prestonia. 



cc, Throat without scales 14. ValUins. 



BB. The anthers included. 



c. lyvs. usually in whorls of 3 15. Xerium. 



