KEY TO PLATE XXIII 



No. i. Wood Sage 

 ( Teucrium Scoroilonia, L.) 



a, Flower showing the 2 

 small lateral lobes and trun- 

 cate upper lip.and large lower 

 lip ; exterior $>f corQJ3a hairy, 

 and 4 exserted stainens, 2 

 long, 2 short., ^, Calyx, per- 

 sistent, bell-shaped, ,-lobed, 

 with broader upper lip bent 

 back, ajid persistent bifid 

 stigma, and long style. c t 

 Inflorescence, with paired 

 ste'm-leaves below, forming 

 unilateral raceme with nu- 

 rous whorls. of 2-3 fiowers, 

 md bracts at thejr base. 



Jpurge 

 loides,U 



i i a*- F lower with bracts re- 

 moved, showing crescentic 

 glands, stamens, and pistil 

 (drooping), c, Capsule (2- 

 lobed). c, Inflorescence, 

 with stem-leaves at base, 

 and made up of flowei heads 

 with many male and i female 

 flowers, subtended by con- 

 nate bracts, in 3 many-rayed 

 umbels, with the cuspidate 

 glAnds within each involucre 

 of* sepals. 



-N-^j f 



No. 3. Dog's Merctfijy 'j, 



(Mercurialis pertnnis, L.) 



a, Male flower, with 9 



stamens, with 3 sepals. , 



Female, flower, with centra! 



pistil, with. 2 hairy ovaries, 



and long bent-back styles. 



c, Didymous, hairy capsules. 



d, Raceme, with male flowers 

 in the axils of bracts on iong 

 stalks. e, Flowering stem 

 with lance -shaped leaves, 

 shortly-stalked opposite, de- 

 cussate, and female flowers 

 iny' -short spikes, showing 

 ovaries and stigmas. 



No. 4. Wych Elm 

 (Ulmus glabra, ttuds.) 



a, Staminate flower, show- 

 ing bell-shaped Snd Calyx, 

 and exserted purple anthers 

 on long filaments, b, Hori- 

 zontal section of winged 

 fruit, with i seed in the 

 , centre of the samara. r, 

 Part of branch, with leaf 

 unequal at the base, with 

 notched margin, and a cluster 

 of -lateral fruits, showing the 

 broad wing, and central seed 

 of the samara, d, Flowering 

 twig, with several clusters of 

 flowers, showing the flowers 

 with anthers exserted, and 

 scales below which 



lly drop off. 



/T^o. 5. Oak 

 1 (Q#er$us Robur, L.) J 

 a, Stamina^e flower, with [ 

 8 stamens and deeply divided 

 calyx. b< Pistillate flowe*i 

 with imbricate bracts enclos- 

 ing pistil, 3 styles above, 'c, . 

 Twig with lobed leaves, with . 



\^ no auricle at the base, stip- 

 ; \ules, and mak- tlov-.ets in 

 Scatkins, feninle flowers in 

 a spike. </, Acorn, or fruit, 

 one developed with cupule, 

 me undeveloped on long 

 flower -vjjtalk (peduxiculate 

 /type)./ _ 



No. 6. Beech 



(Fagulsylvatica, L.) 



, Pistillate flower will* 



ovary, and 3 styles above 



*, Fruit (beech-: 



angled, c, FOUJ -fid involucre 



or cupule of fem.Ue, flower. 



'd, Twig with lo.ng- stalked 



hairy leaves, scale-like stipule, 



and nMUiinar-.: fas^el-like 



flower^' with many stam,eus 



and ove? lapping bracts be- 



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