Ki:y to thk Famii.ies ok ()i{i)i;i;s. 



A. 4'nl.vx superior <]Hlli<>r<>iit in (lie oviiry). 



* Stamois united by their anthers. 



CucuRBiTACE^. — Tendril-beariiig herbs oi! 



CoMPOsiT.K. — Flowers in heads, surrounded by an 



involucre 64 



LoBELiACE.*:. — Flowers not in heads. Corolla split 



down one side 83 



» * Stamens not united together in any way. 



■i- Stamens inserted on the corolla. 



I 



DiPSACE.s. — Flowers in heads, surrounded by an 



involucre. Plant prickly 6.3 , 



VALEKiANACE.ii. — Flowcrs white, in clustered 

 cymes. Stamens fewer than the lobes of the 

 corolla 63 



RuBiACE.B. — Leaves, when opposite, with stipules ; , 



when whorled, without stipules. Flowers, if | 



in heads, without an involucre 61 



Caprifoliace.e. — Leaves opposite, without sti- 

 pules ; but, in one genus, with appendages 

 resembling stipules 58 



-i — i-Stamens not inserted on the corolla, 



Campaxulace^. — Herbs with milky juice. Sta- 

 mens as many as the lobes of the corolla 63 



Ericace.e. — Chiefly shrubby plants or parasites. 

 Stamens twice as many as the lobes of the 

 corolla 85 



B. t'alyx inferior (free fr«>ni Uie ovary). 



• Stamenn more than the lobes of the corolla. 



Leguminos^. — Ovary 1 -celled, with 1 parietal 



placenta. Stamens mostly diadelphous 33 



Adlumia, in 



FuMAKiACE^. — Plant climbing. Corolla 2-spurred. 11 



Malvace^. — Filaments monadelphous. Carpels 



in a ring 24 



Ericace.'E. — Chiefly shrubby plants, with simple 

 entire leaves. Stamens twice as many as the 

 lobes of the corolla 85 



Polygalace.'E. — Anthers 6 or 8, 1-celied, opening 

 at the top. Pod 2-celled. Flowers irregular ; 

 lower petal keel-shaped, and usually fringed 

 at the top 32 



OxALiDACE^E. — Stamens 10, 5 of them longer. 

 Styles 5, distinct. Leaflets 3, obcordate, 

 drooping at night-fall 27 



* * Stamens just as many as the lobes of the corolla, one 

 in front of each lobe. 



Primulace^. — Stamens on the corolla. Ovary 

 1 -celled, with a free central placenta rising 

 from the base 91 



* * * Stament jiixl ax mmii/ an the lohea of the corolla, 

 iiixerted on its tube alternately willi its lobes. 



■i-0 varies 2, se-parate. 



Apocynace^. — Plants with milky juice. Anthers 

 converging round the stigmas, but not adher- 

 ent to them. Filaments distinct 114 



AscLEPiADACE^. — Plants with milky juice. An- 

 thers adhering to the stigmas. Filaments 

 monadelphous. Flowers in umbels 114 



-! — \-Ovary 4-lobed around the base of the style. 



Mentha, in 



Labiat.e. — Stamens 4. Leaves opposite, aromatic 100 



BoRRAGiNACEJE. — Stamens 5. Leaves alternate... 105 



-i — i- Ovary 1-celled ; the seeds on the walls. 



Hydrophyllace.e. — Stamens 5, usually exserted. 

 Style 2-cleft. Leaves lobed and sometimes 

 cut-toothed 108 



Gentianace^. — Leaves entire and opposite ; or 



(in Menyanthes) of 3 leaflets 112 



-1 — \ — I — \~Ovary luith. 2 or more cells. 



Aquifoliace^.— Shrubs. Corolla almost poly- 

 petalous. Calyx minute. Fruit a red berry- 

 like drupe. Parts of the flower chiefly in 

 fours or sixes 90 



Plantagixace,e. — Stamens 4. Pod 2-celled. 



Flowers in a close spike 91 



Verbascum, in 



Scrophulariace.e. — Corolla nearly regular. 

 Flowers in a long terminal spike. Stamens 5 ; 

 the filaments, or some of them, woolly 94 



Polemoniace.'E. — Style 3-cleft. Corolla salver- 

 shaped, with a long tube. Pod 3-celled, few- 

 seeded ; seeds small 109 



CoxvOLVULACE^. — Style 2-cleft. Pod 2-celled, 

 generally 4-seeded ; seeds large. Chiefly 

 twining or trailing plants 109 



SoLANACE^. — Style single. Pod or berry 2-celled, 



many-seeded 110 



* * * * Stamens feiner than the lobes of the corolla ; the 

 corolla mostly irregular or 2-Upped. 



Labiate. — Ovary 4-lobed around the base of the 

 style. Stamens 4 and didynamous, or occa- 

 sionally only 2 with anthers. Stem square.. 100 



VERBEXACE.i:. — Ovary 4-celled, but not lobed ; the 

 style rising from tlie apex. Or, ovary 1-celled 

 and 1-seeded. Stamens didynamous 99 



Lentibulace.e. — Aquatic. Stamens 2. Ovary 



1-celled, with a free central placenta 93 



Orobanchace.*:. — Parasitic herbs, without green 

 foliage. Ovary 1-celled, with many seeds on 

 the walls. Stamens didynamous 94 



ScKOPiiuLARiACE.?-:. — Ovary 2-celled, with many 



seeds. Stamens didynamous, or only 2 94 



