LINN.EAN CLASS XI., XII. 183 



CLASS XL— ICOSANDRIA. 

 Order I.— MONOGYNIA 



Cactus or Opuntia. Sepals numerous, adhering to the ovary. Petals 

 numerous, obovate, spreading. Stamens numerous. Fruit 1-celled, 

 many-seeded. Cactacece, 56. 



Lythrnm. Calyx cylindrical, -with 4 — 6 short teeth, generally with 

 as many intermediate processes. Petals 4 — 6. Capsule 2-celled, 

 many seeded. Lythracece, 47. 



Cuphea. Calyx tubular, ventricose, 6-toothed, generally with as 

 many intermediate processes. Petals 6, unequal. Capsules membra- 

 nous, 1 — 2-celled. Lythracece, 47. 



Decumara. Calyx 8 — 12-cleft, tube campanulate. Petals 8 — 12, 

 narrow, oblong. Capsule 5 — 10-celled, ribbed, opening between the 

 ribs. Saxifragacece, 59. 



Philadelphus. Calyx 4 — 5-parted, persistent. Petals 4 — 5, broadly 

 obovate. Styles more or less united. Capsules 4 — 5-celled. Seeds 

 numerous. Saxifragacece, 59. 



For Prunus, Cerasu.% Amygdalos, Chrysobalanus, see Natural Order, 

 44. 



Mentzelia. Calyx 5-lobed. Petals 5, sometimes 10, the inner ones 

 usually smaller. Stamens numerous, the outer ones often petaloid. 

 Ovary inferior, 1-celled, about 6-seeded. (Herbaceous.) Loasacece, 51. 



Order II. to Order V.— DI-PENTAGYN1A. 



FothergWa. Calyx 5 — 7-toothed, or truncate, campanulate. Petals 

 aone. Styles 2, filiform, distinct. Capsule 2-lobed. Seeds one in 

 ^ach cell. Hamamelacece, 60. 



For the other genera of this order, viz. Agrimonia, Crategux, Ame- 

 lanchier, Pyrus, Spirea, and Gillenia, see Natural Order, 44. 



Order XII.— POLYGYNIA. 



Calycanthua. Sepals and petals confounded. Segments colored, pe- 

 'aloid, seeds numerous, contained in an enlarged, ventrk-ose calyx. 

 t Sweet shrub.) Calycanthacece, 45. 



For the other genera of this order, viz., Rosa, Rubus, Waldsteinia, 

 Geum, Potentilla, Fragaria, see Natural Order, 44. 



CLASS XIL— POLYANDRIA. 



Stamens numerous, perigynous. 



Tilia. Sepals 5, united at the base. Petals 5. Ovary 5-celled, with 

 2 ovules in each cell. Fruit ligneous, sometimes only 1-celled, 1 — 2- 

 seeded. Trees. Tiliacece, 34. 



Corchorus. Sepals 4 — 5. Petals 4—5, hypogynous. Capsule 2 — 5- 

 cell^d, pod-like, seeds numerous. Nearly herbaceous. Tiliacece, 34. 



Helianthemum. Sepals 5, unequal, the 2 exterior small, bracl-lilcc, 

 sometimes wanting. Petals 5, sometimes wanting. Stigmas 3. Cap- 

 sule 3-angled. Cislaceai, 18. 



Portulacca. Calyx superior, 2-parted. Petals 4 — 6, pqual, inserted 



