• 464 APPENDIX. 



Raphe, in seeds, the channel of vessels which connects the chalaza with the 

 hilum ; in umbelliferous plants, the line of junction of the two halves 

 of the fruit. 

 Ray, see Radius. 

 Receptacle, the enlarged apex of the peduncle, which supports the organs 



of fructification. See Dandelion, &c. 

 Recess, the bay or sinus of lobed leaves. 

 Reclinate, leaning back. 

 Recurved, curved backwards. 

 Reflexed, bent back. 

 Reniform, kidney-shaped ; as the leaves of Asarabacca, Ground-Ivy. Reni- 



form -cordate, between kidney and heart-shaped. 

 Repand, undulated and unequally dilated at the margin. 

 Resupinate, inverted in position, so that that which should be the summit 



becomes the base. 

 Reticulated, netted ; covered with lines or veins interwoven like the meshes 



of a net, as some leaves and seeds. 

 Refuse, appearing as if cut off transversely at the end, abruptly obtuse ; as 



the petals of Dill, the silicle of Fumitory. 

 Revolute, rolled back ; as the stigmas of Dandelion, the margins of the 



leaves of Rosemary. 

 Rhizoma, root-stock; a creeping, thickened, subterranean stem, throwing 

 out rootlets from the under side, and annually producing new plants ; 

 as in Buckbean, Fern, Sweet Flag, Herb Paris. 

 Rhomboid, oval, a little angular in the middle ; as the scales of the cone of 

 Fir. Rhomboid-lanceolate, between rhomboid and lanceolate; and so 

 on of other compounds. 

 Rib, the projecting vein of a leaf ; also the longitudinal prominences on 



the calyx of labiate plants. 

 Ridges, longitudinal elevations on the fruit of umbelliferous plants : there 

 are five ridges on each carpel, three on the back, called dorsal, and one on 

 each side at the edge, lateral or marginal ; these are named primary, 

 but they are sometimes obliterated more or less ; there are occasion- 

 ally four other small or secondary ridges, alternate with the former. 

 Rigid, stiff. 



Rimose, having a longitudinal fissure or fissures. 

 Ringent, personate, gaping ; applied to a corolla divided into two lips ; as 



in Honeysuckle, Rosemary, &c. 

 Rooting, throwing out roots from the procumbent stem ; as in Brooklime, 



Water-cress. 

 Rotate, wheel -shaped ; a corolla is said to be rotate when the tube is very 



short and the limb flat ; as in Bitter-sweet, Brooklime, Elder, Holly. 

 Roundish, nearly round. Roundish-obovate, inversely ovate, but somewhat 



round. Roundish-cordate, heart-shaped though nearly round. 

 Rufous, reddish orange. 

 Rugose, wrinkled ; as the leaves of Cowslip, Foxglove, Horehound. 



