558 



RA VENSARA 



Ravensara Sonnerat. Lauraceae (n). 4 Madag. R. aromatica J. F. 

 Gmel. is the Madagascar clove (fr. a spice). 



Ravnia Oerst. Rubiaceae (i. 5). i Costa Rica. 



Rawsonia Harv. et Sond. Flacourtiaceae (i). 5 S. and trop. Afr. 



Ray flowers, Compositae, Unibelliferae. 



Razisea Oerst. Acanthaceae (iv. B). i Costa Rica. 



Razor grass (W.I.), Scleria pterota Presl. 



Re- (Lat. pref. ), back or down ; -ceptacle, see separate article ; -clinate, 

 bent downwards; -current (venation), veins returning towards mid- 

 rib ; -curved, bent back or down ; -duction, see separate article ; 

 -duplicate (aestivation) see Aestivation (vernation), Palmae\ -flexed, 

 bent abruptly downwards or backwards; -fracted, bent sharply 

 backward from the base ; -gression, reversion ; -juvenescence, re- 

 newal of growth from old or injured parts; -production, see separate 

 article; -supination, Lobelia, Lophanthns, Orchidaceae; -ticulate, 

 netted ; -tiform, apparently netted ; -trorse, directed back or down- 

 wards ; -tuse, broadly notched (Gd in fig., Leaf); -versed, upside 

 down, Ahtroetneria, Bomarea, Brachypodium', -version to type, 

 Acacia, Bossiaea, Cactaceae, Russellia; -volute, margins rolled out- 

 ward. 



Reaumuria L. Tamaricaceae. 15 E. Medit., C. As. Halophytes. 



Reboudia Coss. et Dur. (Eiticaria BH.}. Cruciferae (2). 2 N. Afr., 

 W. As. 



Rebsamenia Conzatti. Malvaceae (2). i Mexico. 



Rebutia K. Schum. (Echinocactus p.p. EP.}. Cactaceae (in. i). 

 i Argent. 



Receptacle, the portion of stem upon which the fl. (or infl.) is actually 

 borne. According to its form the ovary may be superior or inferior, 

 the fl. hypo-, peri-, or epi-gynous (q.v. and see fig-). 



A 



DIAGRAMMATIC LONGITUDINAL SECTIONS OF FLOWERS, to show types of re- 

 ceptacle, ovary, stigma &c. A, hypog. fl. with uniloc. ovary, parietal plac., and 

 numerous ascending anatr. ovules with raphe downwards ; stigma sessile, bilobed. 

 B, perig. fl. with multi-loc. ovary, axile plac., and numerous horiz. anatr. ovules 

 with raphe upwards ; style with bifid stigma. C, epig. fl. with multi-loc. ovary, 

 apical plac., and sol. pend. anatr. ovules with ventral raphe ; style long with capitate 

 stigma, r, recept. ; k, calyx; c, corolla; a, stamens; o, ovary; st, stigma. 



