XXXIV LINN^AN ARRANGEMENT 



Hemianthus. Calyx tubular, cleft on the under side ; border 4-toothed. 

 Corolla with the upper lip obsolete ; the lower 3-parted ; intermediate seg- 

 ment ligulate and truncate, much longer and closely incurved. Capsule 

 1 -celled, 2-valved, many-seeded. Scrophidariacece, p. 263. 



Catalpa. Calyx 2-parted. Corolla campanulate ; tube ventricose ; limib 

 5-lobed, unequal. Stigma in 2 plates. Capsule pod-form, long, cylindric, 

 2-valved. Seeds membranaceously winged. Bignoniacea, p. ^2. 



JusTiciA. Calyx 5-parted, often with 2 bracts at the base. Corolla ir- 

 regular, bilabiate; upper lip emarginate; lower 3-cleft, Anthers 1 or 2 

 on each filament. Capsule attenuated, 2-celled, 2-valved. Acanthacece, 

 p. 286. 



Utricularia. Calyx 2-parted; lips undivided, nearly equal. Corolla 

 personate, with the lower lip spurred at the base. Stigma 2-lipped. Cap- 

 sule globose, 1 -celled. LentibulariacecB^ p. 287. 



PiNGUicuLA. Calyx 4 — 5-clefl, unequal. Corolla ringent, spurred at the 

 base beneath. Stigma of 2 plates or lobes. Capsule 1-celied. Lentilnda- 

 riacecB, p. 287. 



Elatine. Calyx 2 — 4-parted. Petals 2 — 4. Capsule 2— 4-vaIved; 

 margin of the valves not introflexed. Elatinacea, p. 53. 



Obs. The remaining genera of this division have the corolla more or less 

 bilabiate, and four naked seeds or achenia enclosed within the persistent 

 calyx. They form, with the plants of Dldynamia Gijmnospermia, (from 

 which indeed they only differ in having* two of the stamens abortive,) the 

 Natural Order Labiata^ p. 270. 



*** 



Perianth double, superior. 



CiRCiEA. Calyx short; limb 2-parted. Petals 2. Stigma emarginate. 

 Capsule obovate, hispid with hooked hairs, 2-celled, 2-valved 2-seeded. 

 Ojiagracea, p. 111. 



**** Perianth single or none. 



Lemna. Spathe membranaceous, urceolate, with 2 sterile flowers. Sta- 

 mens 2, rarely wanting. Filaments longer than the style, curved. Stigma 

 flat. Fruit a utricle. Pistiacea, p. 384. 



Cladium. Flowers glumaceous. Spikelets 2-flowered. Scales few, 

 imbricate in a somewhat trifarious manner; the lowest empty. Bristles 

 none. Style 2 — 3-cleft. Achenium globose-ovoid. CyperacecB, p. 399. 



Order II.— DIGYNIA.— 2 Pistih. 



Anthoxanthum. Flowers glumaceous. Spikelets 3-flowered ; the two 

 lower flowers neutral, and each consisting of a single aw^ed.palea; the 

 upper flower perfect, of two paleae, nearly equal, short, awnless. Gram- 

 minacece, p. 437. 



CLASS III— TRIANDRIA.— 3 Stamens. 



Order I.— MONOGYNIA.— 1 Pistil. 



* Perianth double, supenor. 



Fedia. Calyx with the limb toothed and persistent or obsolete. Corolla 

 tubular, not spurred ; the limb 5-lobed, regular or slightly irregular. Fruit 

 3-celled ; 2 cells empty, (sometimes confluent into one,) the other 1-seeded. 

 Valerianacea, p. 153. 



