S4 CLASS XII. ORDER I. 



Order XIII. Polygynia. 



Sempervivum. Calyx 9 to 12.parted : petals 8 

 to 12 : capsules 12, many-seeded. (Stamens 16 or 

 20.) 13. 83 — tectorum, (house leek) leaves ciliate, 

 offsets spreading, ll-^-arbureumy branched woody. 



CLASS XII. ICOSANDRIA. 

 Order I. Monogynia. 



Philadelphus. Calyx 4-5-parted, superior : 

 Corol 5-petalled : style 4- cleft : capsule 4-5-celled, 

 many-seeded ; seed arilled. 19. 89 — coronarius 

 (false syringa, or mock orange) leaves slightly 

 toothed. ^ . w. 



Prunus. Calyx 5-cleft, inferior : corol 5-petal- 

 led : nut of the drupe smooth with prominent seams 

 at the sutures. 36. 92 — borealis^ fruit ovatish, umbels 

 sub-corymbed, sessile, few-flowered, leaves acu- 

 minate, petioles with 2 glands, ^i . w.~-~virginianaf 

 (wild cherry) flowers in erect compact racemes, 

 leaves doubly-toothed, petioles with about 4 glands. 

 ^ . w. — serotina (choak-cherry) racemes lax, serra- 

 tures simple, lower ones sub-glandular, ^i . w— 

 cerasus (common cherry) umbels sub-sessile, leaves 

 lance-ovate. I2 • w. e — domestical (common plum) 

 peduncles sub-solitary, leaves lance-ovate, e. 



Cactus. Calyx superior, 1-leafed, imbricate; 

 petals numerous, in many series, the inner ones lar- 

 ger ; stigma many-cleft: berry 1-celled, many- 

 seeded, navelled. 13. 85 — o/iuntia^ (prickly pear) 

 nearly stemless, leaves very thick, succulent and 

 proliferous, y. 



Myrtus. Calyx superior, 5-cleft : petals 5 : 

 berry 2 or 3-celled, many-seeded. 19. 89 — commu- 

 nis, (myrtle) flowers solitary. Ij . w. 



Amygdalus. Calyx 5-cleft, inferior : petals 5 : 

 drupe with a nut perforated with pores ; flowers 



