I LINN^AN ARRANGEMENT 



CLASS XL— ICOCANDRIA.— 20 or more Stainens placed on the Calyx. . 



Order L— MONOGYNIA.—l Pista. 



OpuNTiA. Sepals numerous, leafy, adnata to the ovary ; outer ones flat, 

 short; inner ones petal-like, obovate, rosaceous; tube above the ovary 

 none. Berry ovoid, umbilicate at the apex, tuberculate, often bearing spines. 

 Cactacecc, p. 123. 



•Prunus. Calyx urceolate, hemispheric ; limb 5-parted, deciduous. Drupe 

 ovoid or oblong, fleshy, very smooth, covered with grayish dust ; stone com- 

 pressed, acute at both ends, subsulcate at the margin, elsewhere smooth. 

 DritpacecB, p. OU. 



Cerasus. Flowers as in the preceding. Drupe globose or umbilicate 

 at base, fleshy, very smooth, destitute of gray powder ; nucleus subglobose, 

 smooth. Drupacccs, p. 9L 



Lythrum. Calyx cylindric, striate, 8 — 12-toothed. Petals 4 — 6, inserted 

 into the calyx. Capsule oblong, 2-celled, many-seeded. LythroxecB, p. 115. 



Decodon. Calyx short, broad-campanulate, lO-toothed ; 5 teeth longer 

 and spreading. Petals 5. Capsule covered with the calyx, 3 — 4-celled. 

 LythracecE, p. 116. 



CuPHEA. Calyx tubular, ventricose, 6 — 12-toothed, unequal. Petals 

 6 — 7, unequal. Capsule membranaceous, 1 — 2-celled, at length- bursting 

 longitudinally. Lythracece, p. 116. 



Order 1L— DI-PENTAGYNIA.— 2— 5 Pistils. 



Sesuvium. Calyx 5-parted, persistent ; lobes colored within. Petals 

 none. Styles 3 — 5. Capsule 3- rarely 4 — 5-celled, opening circularly, 

 many-seeded. Tetragoniacea, p. 123. 



Obs. The remaining genera belong to the Natural Orders Rosacea^ 

 p. 92, and Pomacea, p. 102. 



Order IIL— POLYGYNIA.— iVIany Pistils. 



Calycanthus. Lobes of the calyx in many rows, imbricate, lanceolate, 

 colored, all more or less coriaceous or fleshy. Corolla none. Stamens un- 

 equal. Nuts enclosed in the fleshy tube of the calyx. Calycanthacecc, 

 p. 107. 



Obs. The remaining genera belong to the Natural Order Rosacea, 

 p. 92. 



CLASS Xn. — POLYANDitiA. — Many Stamens inserted upon the Receptacle. 

 Order L— 3I0N0GYNIA.~1 Pistil. 



TiLiA. Calyx 5-parted, deciduous. Petals 5, naked, or with a small 

 scale within. Fruit coriaceous, by abortion 1-celled, 1^2-seeded. Tilia- 

 cea, p. 56. 



Helianthemum. Calyx with 3 equal sepals, or 5 disposed in two rows; 

 the two outer ones smaller, rarely larger. Petals 5, (sometimes wanting,) 

 often irregularly denticulate at the apex. Capsule 3-valved, with the dis- 

 sepiment in the middle of the valves. Cislacece, p. 34. 



Hudsonia. Calyx 5-parted ; segments unequal, the two outer ones 

 minute. Petals 5. Capsule 1-celled, 3-valved, 1— 3-seeded. Cislaccce, 

 p. 36. 



