168 LINN^AN CLASS III. 



Oxifhaphus. Involucre 3 — 5-cleft, 1 — 3 flowered. Perigonium tabu- 

 lar, limb plicate, eampanulate. Stamens 3 — 4. Fruit ovate, ribbed. 

 (Herbaceous plants.) Nyctaginace<x, 98. 



Boerhaavia. Perianth on a minute, glandular rinor, white and 

 tinged with purple. Stamens varying in number. Fruit angled, ob- 

 conic. Nyctaginacece, 98. 



Burmayinia. Perianth tubular, winged, 6 parted. Alternate seg- 

 ments small, connivent. Capsule 3-celled, 3-valved, many-seeded. 

 BurmannlacecR, 125. 



Ixia. Perianth 6-parted, expanding. Spathe ovate, short, 2 — 3- 

 valved. Iridaccce, 124. 



B. Floxoers inferior. 



Commelyna. Sepals 3, unequal. Petals 3, unequal. Stamens 'un- 

 equal. Style simple. Capsule Scelled, 3-valved. (Day-flower.) Com- 

 melynacece, 136. 



Xyri!^. Flowers in dense heads ; bracts coiiaceous, each inclosing a 

 single flower. Sepals 3, unlike. Petals 3, with long claws, more or 

 less cohering. Style 3-cleft. (Yellow-eyed grass.) Xyridacece, 133. 



Heteranthera. Perianth salver-form, equally 6-parted. Stamens un- 

 equal. Capsule 3-celled, many-seeded. (Mud-plantain.) Pontederia- 

 ccce, 132. 



Syena. Maycea. Sepals 3, or calyx deeply 3-parted, persistent. 

 Petals 3, roundish. Anthers 2-celled. Stigma 3-cleft. Capsule 1-celled, 

 3-valved. Pontederiacece, 132. 



Stipulicida. Sepals 5, or calyx deeply 5-parted. Petals 5, oblong. 

 Style short. Stigmas 3. Capsule 1-celled, 3-valved. Illecchracece, 20. 



Any grasses that might come in this place are referred to the Analysis 

 of Cyperaceas, No. 141. 



Order II.— DIGYNIA. 



This order embraces a large portion of the grasses which are referred 

 for analysis to the order Graminacece, No. 142. 



Order III— TRIGYNIA. 



Mollago. Sepals 5. Petals usually wanting. Stamens varying 

 from 3 — 5. Styles short. Pod 3-celled, 3-valved, many-seeded. 

 (Chick-weed.) Caryophyllacece, 21. 



Lechea. Sepals 3. Petals 3, narrow, lanceolate. Stamens varying 

 from 3 — 12. Style short. Stigmas fringed. (Pin weed.) Cistac€ce,\%. 



Proserpiiiaca. Calyx 3-parted. Tube 3 sided. Petals none. Stigmas 

 papillose, fruit bony, 3-angled, 3-celled, 3-seeded. (Mermaid-weed.) 

 Onagracece, 60. 



Polycarpon. Calyx 5-leaved. Petals 5, linear, very short, emargi- 

 Date. Stamens longer than the corolla. Capsule ovate, 1-celled, 3- 

 valved. Illecebracea, 20. 



Triglochin. Perianth 4 — 6-leaved, lanceolate, membranous. Anthers 

 sessile. Style none. Carpels 3 — 4-seeded, 1 in each cell Alismacecr 

 137. 



