58 



inserted into the calyx. Disk large, cup-shaped, filling up the whole of the tube of the calyx, 

 and projecting beyond it. Ovarium 2-celled, with an erect ovTilum in each cell ; style simple, 

 arising out of the disk ; stigma emarginate. Fruit 2-celled, 2-valved, 2-seeded. Seeds 

 solitary, erect > albumen none ; embryo erect ; radicle short, inferior — Herbaceous plants. 

 Leaves opposite, toothed, stalked. Flowers in terminal and lateral racemes, covered with 

 uncinate hairs. 



Affinities, This order differs from Onagrariae in its large fleshy 

 disk, which fills up the tube of the calyx, in its solitary erect ovula, and 

 in the binary division of the flower. It is connected with that order through 

 Lopezia, with which it cannot, however, be absolutely associated ; and bears 

 about the same relation to Onagrariae as is borne by Halorageae. 



Geography. Natives of the northern parts of the world, inhabiting 

 groves and thickets. 



Properties. Unknown. 



Example. Circaea. 



L. HYDROCARYES. The Water Chestnut Tribe. 



Hydrocaryes, Link Enum. Hort. Ber. 1. 141. (1821) Onagrari^, § Hydrocaryes, 



Dec. Prodr. 3. 63. (1828.) 



Diagnosis. Polypetalous dicotyledons, with definite perigynous sta- 

 mens, concrete carpella, an inferior ovarium with definite pendulous ovules, 

 no albumen, and very unequal cotyledons. 



Anomalies. 



Essential Character Calyx superior, 4-parted. Petals 4, arising from the 



throat of the calyx. Stamens 4, alternate with the last. Ovarium 2-celled ; ovules solitary, 

 pendulous ; style filiform, thickened at the base ; stigma capitate. Fruit hard, indehiscent, 

 1-celled, 1-seeded, crowned by the indurated segments of the calyx. Seed solitary, leirge, 



pendulous ; albumen none ; cotyledons 2, very unequal Floating plants. Lower leaves 



opposite, upper alternate; those under water cut into capillary segments ; petioles tumid 

 in the middle. Flowers small, axillary. 



Affinities. Closely akiu to Onagrariae, from which they are distin- 

 guished by their solitary pendulous ovules ; more closely allied to Halorageae, 

 from which they are divided only by their very large seeds with unequal 

 cotyledons, developed calyx, and want of albumen ; agreeing with them, 

 especially with Myriophyllum, in habit. 



Geography. Found in the south of Europe, the East Indies, and 

 China. 



Properties. The great seeds are sweet and eatable. 



Example. Trapa. 



LI. LOASEiE. 



LoASEvE, Juss. Ann. Mus. 5. 18. (1804); Did. Sc. Nat. 27- 93. (1823); Kunth in Nov. 

 Gen. et Sp. G. 115. (1823); Dec. Prodr. 3. 339. (1828.) 



Diagnosis. Polypetalous dicotyledons, with perigynous stamens, part 

 of which are sterile, concrete carpella, an inferior 1-celled ovarium with 

 parietal placentae, and dissimilar petals and sepals. 



Anomalies. Ovarium sometimes almost superior. Seeds definite in 

 Mentzelia and Klaprothia. 



