26 MUSTARD ORDER 



RAPHANUS Linne 1753 RADISH 



(Gr. rha-, quick, phanos, appearing, from its quick germination) 



PL 6, fig. 36. 



Sepals 4, petals 4, pink, white or yellow, stamens 6, pod lance-linear, 

 round in section, usually constricted, beaked, 2-10-seeded, remaining closed 

 on ripening, style slender ; flowers in racemes or corymbs ; leaves usually 

 pinnatifid; annual or biennial. 



1. Flowers yellow, fading to white; pod 4-10-seeded R. raphanistrum 



2. Flowers pink or white ; pod 2-3-seeded R. sativus 



RORIPA Scopoli 1760 WATERCRESS 



(Name of unknown origin and meaning) 



PI. 6, fig. 12-14. 



Sepals 4, petals 4, yellow or white, stamens 1-6, pod oblong to cylindric, 

 rarely globoid, round in section, occasionally 1-celled, seeds typically in 2 

 rows, style mostly short ; flowers in racemes ; leaves pinnatifid to pinnate- 

 dissected, rarely entire ; annual, biennial or perennial, some aquatic. 



1. Flowers white 



a. Floating or creeping ; leaves of 3-9 leaflets R. nasturtium 



b. Erect ; leaves pinnatifid R. trachycdrpa 



2. Flowers yellow 



a. Annuals or biennials 



(1) Pods usually curved, oblong R. curznsiliqua 



(2) Pods and pedicels rarely curved 



(a) Plant erect, 1-4 ft. high, smooth to his- 



pid hairy ; pods globoid to oblong R. palustris 



(b) Plant diffuse, .5-1 ft. high, spreading, 



usually smooth ; pods globoid to ob- 

 long R. obtusa ' 



b. Perennials, with a horizontal rootstock, low 



and spreading R. sinudta 



SISYMBRIUM Linne 1753 TANSY, MUSTARD 



(Gr. sisymbrion, name of some aromatic plant) 



(Sophia Adanson, Schoenocrambe Greene) 



PL 6, fig. 23-26. 



Sepals 4, petals 4, yellow or yellowish, stamens 6, pods linear, round 

 or flat in section, seeds in 1 or 2 rows, style distinct; flowers in racemes; 

 leaves entire, pinnatifid or pinnate; annual, biennial or perennial. 



