466 NATURAL HISTORY OF PLANTS. 



species of which the genus Jussiœa ' has been, formed. The oppo- 

 sitipetalous stamens are there the smallest, 3 and sometimes they even 

 remain sterile. In one species of this genus found in Europe, L. 

 palustris, better known under the name of Isnardia palustris, the 

 petals, four in number, are little developed, and with them alternate 

 normally four epigynous stamens ; but here and there may be 

 observed besides in their intervals, one or two stamens which may 

 be fertile. In the true Ludwigia, common especially in America, 

 the oppositipetalous stamens are normally wanting ; when they here 

 and there exist, they are represented only by slender and sterile 

 filaments. The genus Ludwigia, thus understood, 3 is moreover dis- 

 tinguished from Œnothera by its fruit, which, instead of being 

 loculicidal, is poricidal or, more generally, septicidal. They are 

 evergreen or annual herbs, nearly always aquatic, rarely shrubby at 

 the base. The leaves are alternate or opposite, accompanied by 

 stipules but little developed ; the flowers 4 are ordinarily axillary, 

 accompanied or not by a bud superposed to them, and they bear, at 

 a greater or less height, on their peduncle or on their ovary, two 

 lateral bracts, sometimes foliaceous. 5 This genus, abundant espe- 

 cially in all warm countries, is however represented in temperate 

 North America and even in Europe. It comprises about forty 

 species, 6 though nearly double that number have been described. 

 Clarhia 1 is distinguished from Onagra and Ludwigia only by 



1 L. Gen. n. 538. — J. Gen. 319.— Lamk. Diet. 3 Ludwigia f 1 " I/udwi 9 iaria (DC. not L.). 



iii. 330; Suppl. iii. 198 ; 111. t. 280.— DC. Prodr. gect 3 ' ] 2. Dantia (Pet.). 



iii. 52. — Spach, Suit, à Buffan, iv. 340. — Endl. C3. Jussiœa (L.). 



Gen. n. G109. — B. H. Gen. 7S8, n. 3. — H. Bn. * Yellow, sometimes rather large. 



Payer Fam. Nat. 373. — Martins, Mem: sur les 5 The axillary hud may he developed. (See 



Jussiœa [18G6], cum tah. 4.— Hook. Fl. Ind. ii. H. Bn. Adansonia, i. 182.) 



587. — Cubospermum Lour. _F7. Cochiiich. (éd. 6 Geen. et Godr. Fl. de Fr. i. 585 (Isnardia). 



1790) 275.— Vigiera Velloz. Fl.Flum. ii. t. 73, —A. S.-H. Fl. Bras. Mer. ii. 253, t. 131-133 



74. — Corynostigma Presl, Epim. 218. (A great (Jussiœa). — H. B. K. Nov. Gen. etSp. vi. t. 530- 



many authors have written Jussiena or Jussia.) 533 (Jussiœa). — Wight, III. t. 101 ; le. t. 762. — 



■ They are finally more exterior than the Thw. Fnum. PL Zeyl. 123. — Franch. et Sav. 



large alternipetalous stamens, and each is accom- Enum. PI. Jap. 169. — Oliv. Fl. Trop. Afr. ii. 



panied within its hase hy a lobe of the epigy- 488 (Jussiœa), 490. — Torr. et Gray, Fl. N.- 



nous disk in the form of a crescent with con- Amer. i. 520 (Jussiœa), 521. — Walp. Hep. ii. 72 



cavity exterior. Here and there oppositipetalous (Jitssiœa), 74 ; ii. 664 ; Ann. i. 290 ; ii. 531 ; iv. 



stamens, 1-3, are observed in the trimerous 675. 



flowers of a curious plant from Senegal which ' Pursh, Fl. Amer. Sept. i. 260, 1. 11 (Clarckia). 



De Candolle (Mém. Onagrar. [1829] 7, t. 2 ; — Nutt. Gen. i. 249.— DC. Prodr. iii. 52.— 



Prodr. iii. 58) named Prienrca, and which by Sp ach, Nouv. Ann. Mus. vi. 395 ; Suit.it Buffon, 



some has been considered an abnormal form of iv. 394. — Endl. Gen. n. 6119. — B. H. Gen. 789, 



Jussiœa, by others of Ludwigia ; which unites n. 5. — Phœostoma Spach, S. à Buffan, iv. 392 ; 



still more closely the two types. (See H. Bn. N. Ami. Mus. iv. 327. — Gruropsis Presl. Epim. 



Bull. S<r. Linn. Par. 102.) 219 (?). — Opisanthes Ltua, Linnaa, xv. 261. 



