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590 



LXii. ONAGRACE^. (C. B. Clarke.) 



[Trap a.' 



5. 





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V'. 



Floating lierbs. Leaves dimorphic ; submersed opposite, root-like, pinnati- 

 partite, witli filiform segments; emersed rosulate, rhomboidal, the petiole with 

 a spongy dilatation near its apex. Flowers axillary, solitary, peduncled. Calyx- 

 tube short, adnate to the lower part of the ovary ; limb 4-partite, 2 or all the 

 segments persistent and becoming spinescent on the fruit. Petals 4, white, 

 small, inserted at the margin of an epigynous disc. Stamens 4t. Ovary half- 

 inferior, with a conical vertex, 2-celled ; style subulate, stigma capitate; ovule 

 solitary in each cell, pendulous from the upper inner angle. Fruit bony, 

 1-celled, large, obovoid, with 4 angles, 2 or all of which carrj' spines, indehia- 

 cent, with a short cylindric beak at the top through which the radicle is pro- 

 truded. Seed 1, inverse, cotyledons very unequal. — DiSTRiB. Species 2, ex- 

 tending through the warmer parts of the Old World, from Central Europe to 

 China and to Tropical Africa. ^-^ 



1. T. bispinosa, Roxb. Cor. PI. 234 ; Ilort. Beng. U ; Fl. ind. i- 4^' 

 leaves usually very villous beneath, fruit with 2 angles spinescent. DC. Pi-oar- 

 iii. 64 ; Wall. Cat. 6339 ; W. 8f A. Prodr. 337 ; Miq. Fl. Ind. Bat. i. pt._i 

 636 ; Dalz. 8f Gibs. Bojnb. Fl. 99 ; Kurz in Journ. As. Soc. 1877, pt. n. 91. 

 quadrispinosa. Wall. Cat. 6340 not Roab. — Rheede Hort. Mai. xi. t. 33. 



T. 



V. 



Throughout India and Ceylon. 

 pical Africa. 



In the Roxburgl 



DisTRiB. South-eastern A&ia and Malaya ; Tro- 



tenor margin entire 



ghian typo, floating leaves 2 by 2^-3 in., very villous beneath, ^pos- 

 ire, anterior lightly crenate ; petiole 4-6 in., woolly. Frutt 4 in- 



long and broad, glabrous or hairy ; two opposite angles each with an often ^®^.^^?^^ 

 scabrous spine, the other two angles sometimes obsolete.— Very doubtfully distinc 

 from the next species as Wallich bis noted on his specimens. - :■ • .^ 



Var. m^wa, Wall. ; leaves much smaller about f in. much less villous beneain 

 incise serrate on the anterior margin.— Marked also T. quadrispinosa by Wallicn, 

 but though the leaves are the leaves of T. nutans, the fruit is that of T. bisptnosa. 



>, 



2. T. natans, Linn. ; DC. Prodr. iii. 63 : leaves sparingly villous on the 



-— -' ' jing spines. Lamk. la. t. 75; Sms- 



T. quadrispinosa, Roxb. Hort. Bmg. 11 ; Fl. Ind.i. 40i, 



nerves beneath^ fruit with all 4 angles carrying spines. LamL lU. t. 75ySoiss 

 FL Orient, ii. 763. "" ^ ' ' - - _ - 



Da I c. 



Kashmir; Falconer, Jacqtiemont, Sit.het; Roxburgh (but no example thence a- 

 Kew). — DisTiiiB. Persia to Central Europe and the Upper Nile. . . » 



Floating leaves 1 in., dentate or incise-dentate on the anterior margin; peti| 

 2-4 in., glabrescent. Fruit | in, broad, the 4 angles all spinescent but the two lat^ra 

 spines shorter. 



1^^ 



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Order LXIII. 

 Trees or shrubs. 



. (By 0. B. Clarke, F.L.S.) 



occasio 



ite, often closel 



, , --o-ar, small, axill 



pedicelled, densely fascicled oi* in long simple or panicled racemes 



ionftUy 



fiubsessile, simple, entirely 



lightly 



Flo7ve7'8 reerular, small, axillary; 



shortly 



Calyx 



coriac^eous^ persistent ; tube short, free^ or longer and adnate to *^t ^J^^' 



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lobes \yfL yjj, ^^^*^J^"~^^-^UpA ic 



witn staminodes between ^r ^fl-^t^ 

 with them. ; ;Oi;arw superior or half-superior, 1-celled; styl^,!;,^^? 



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indefinite, often with stam 



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