408 cix. ACANTHACE.E. (C. B. Clarke.) \HygropfaJta. 



Wall. Cat. 7150. H. obovata, Nees in Wall. PI. As. Ear. iii. 81, and in DC. Prodr. 

 xi. 91 (not of Wight, nor Ruellia obovata, Roxb.}. H. undulata, Nees in DC. I. c. 

 91, partly (not Ruellia undulata, Vahl). Proine ; Wallich. Mergui ; Griffith. 

 Distrib. Java, Borneo. Lateral nerves of the leaves patent, arcuate, prominent, 

 regular. Whorls often dimidiate, but entire often, as in Wallich's type speci- 

 men. 



5. H. quadrivalvis, Nees in Wall. PI. As. Ear. iii. 80, and in DC. 

 Prodr. xi. 89 ; erect, leaves lanceolate or elliptic narrowed at both ends 

 glabrate, bracteoles oblong obtuse, calyx in flower divided the way down 

 lobes lanceolate minutely strigillose, capsule much exceeding the calvx. H. 

 obovata, Wight Ic. t. 1489; Nees in PL Hohenack. n. 292. H. undulata, 

 Nees in DC. Prodr. xi: 91, partly. Euellia quadrivalvis, Wall. Cat. 2374, 

 type sheet. R. undulata, Vahl Symb. iii. 82. Rheede Ifort. Mai. ii. 

 t. 46. 



From BENGAL to CEYLON and MALACCA, common. 



Closely resembling H. sal icif olio, except in the points stated. Leaves usually 

 larger, in Euellia undulata attaining 4 by 1| in., undulate on margin. Calyx often 

 gamosepalous long after flowering. Capsule frequently f in., stouter than in H. 

 salicifolia. Ruellia barbata, Vahl Symb. iii. 83, adduced here by Nees, is stated by 

 Vahl to have biaristate anthers, and his description does not otherwise fit well. 



6. K, phlomoides, Nees in Wall. PL As. Ear. iii. 80, and in DC. 

 Prodr. xi. 90 ; erect, leaves subsessile elliptic or oblong hairy, whorls of 

 flowers hirsute often Distant, calyx in flower divided half-way down teeth 

 linear hispid. Ruellia phlomoides, Wall. Cat. 2376, type sheet. R. hir- 

 suta, Roxb. FL Ind. iii. 51. Dipteracanthus ciliatus, Nees in Wall. Cat. 

 715. 



BENGAL, SIKKIM and ASSAM, near the base of the hills ; CACHAB, CHITTAGONG, 

 PEGU. 



Stems 2-3 ft., hirsute upwards. Leaves often 3-6 in., base narrowed, mostly quite 

 sessile. Whorls of flowers dense ; bracteoles linear-oblong, as long as the calyx-tube. 

 Corolla a in. Capsule | in., somewhat exceeding the calyx. 



VAK. Roxburgliii ; branched or decumbent, leaves obovate often shortly petioled 



usually 'small hairy or nearly glabrous, calvx-teeth linear-lanceolate, corolla \ in. H. 



obovata, Griff. Notul. iv. 134. Ruellia obovata, Roxb. FL Ind. iii. 51 ; Wall. Cat. 



* 2375, type sheet. Chittagong, Roxburgh ; Soonderbunds, J^_jP. H., &c. ; Pegu, 



Beddome; Mergui, Griffith. 



VAE. repens; procumbent, rooting, leaves A-H in. obovate, flowers rather smaller. 

 Silhet; 



7. H. incana, Nees in DC. Prodr. xi. 91 (excl. syn. Roxb.) ; erect, 

 innovations closely softly white-hairy, leaves narrowly lanceolate adult 

 densely lineolate on both surfaces, calyx in flower divided more than half- 

 way down, teeth linear softly white-hairy and hispid. Ruellia iucana, 

 Seyne in Herb. Rottler. R. mollissima, Klein ms., not of Vahl. 



DECCAN PENINSULA ; Bottler. 



Leaves 4 by f in., very acute at both ends ; petiole hardly any. Capsule | in., 

 shortly exceeding the calyx. Very distinct by its soft close white hairiness, to which 

 scattered long white hispid hairs are added. It is altogether remote from Ruellia 

 obovata, Roxb. (= H. phlomoides, Nees Var.), of which Roxburgh's picture is in 

 Herb. Kew. 



Subgenus 2. Asteracantha. Spinous. Calyx 4-partite. Seeds 



8. H. spinosa, T. Anders, in Thwaites Enum. 225, and in Joum. Linn. 

 Soc. vii. 22 ; stout, erect, hispid, leaves lanceolate, whorls axillary spinose 



