928 ItAPHANUS. CCLASS XV. oiidkk iw 



short. Sliyma obtuse, depressed, and notched. Seeds small, sub- 

 globose, numerous. 



Habitat. — Watery places, especially in a sandy district. 



Annual; flowering from June to September. 



4. N. amphVbium, Br. (Fig. 1074.) Amphibiovs Nasfurtivm 

 Siliqua oblong, linear, about one-third the length of the slender 

 pedicles ; leaves oblong, lanceolate, serrated, or pinnatifid, smooth ; 

 petals longer than the calyx ; root fibrous, simple. 



English Flora, vol. iii. p. 195. — Hooker, British Flora, ed. 4. vol. i. 

 p. 253. — Lindley, Synopsis, p. 23. — Sisymbrium amphybium^ Linn. — 

 English Botany, t. 1840. 



Root^ long simple fibres. Stem long, branched, trailing, smooth, 

 angular, and furrowed, rooting from the axis of the leaves. Leaves 

 numerous, the lower submersed ones much divided in a pectinato- 

 pinnatifid manner, the upper oblong, lanceolate, sinualo-serrated, with 

 linear lobes, or simply but unequally serrated, all smooth, mostly 

 petiolated, and often auriculated at the base. Injiorescence terminal 

 and lateral sub-corymbose clusters of numerous crowded flowers, be- 

 coming elongated lax racemes in fruit. Calyx oblong, smooth, yellow, 

 spreading. Petals four, oblong, linear, entire, or notched at the end^ 

 longer than the calyx, a golden yellow colour. Fruit linear, oblong, 

 turgid, smooth, terminating in a short slender style^ and crowned by 

 the obtuse capitate stiyma, the pedicle slender, spreading, often three or 

 four times longer than the siliqua. Seeds seldom perfected. 



Habitat. — Banks of rivers, canals, and wet places; frequent. 



Perennial; flowering from June to August. 



This species is readily distinguished from the last by its longer 

 petals, longer and more slender pedicles, shorter pods, which are mostly 

 abortive, and by the shape of the leaves. 



GENUS XXX. RAPPIA'NUS.— Linn. Radish. 

 Nat. Ord. Crucif'ek^. Juss. 



Gen. Char Siliqua linear, or oblong, or sub-conical, smooth and 

 inseparable, or beaded, and separating at the joints, many 

 seeded. Seeds round, pendulous. Cotyledons ccnduplicate. — 

 (See Fig. 3, p. 872.) — Calyx erect. — Name ?=«} quicky rapid; 

 and (poiivofxcn, to appear; so called on account of the rapid 

 growth of some of the species. 

 1. R. RaphanisUrum, Linn. (Fig. 1075.) Wild Radish, or Jointed 



Charlock. Siliqua of one cell, beaded, striated ; st^lc slender, awl- 



Bhapcd; leaves simply lyrate. 



