GBUGIFEBJE. 



191 



Hirschfeldia? the vegetative organs are more or less hoary, and the 

 valves of the fruit, which is 



Brassica (Melanosinapis) nigra (Black mustard). 



{ 



c 



Fig. 235. 

 Flower. 



Fig. 236. 

 Embryo (f). 



here shorter than in Brassica 

 generally, have a dorsal rib 

 and anastomosing veins ; the 

 siliqua ends in an oval beak, 

 and contains a few ovoidal 

 seeds. Thus this plant stands 

 between the other species of 

 Brassica and B. nigra 2 (Black 

 Mustard, figs. 235, 23G), 

 which has been made a dis- 

 tinct genus under the name 



of Melanosinajris? This plant has sessile or very shortly stipitate cap 

 sules, erect and more or less closely applied to the axis 

 of the inflorescence ; the valves have a carinate mid- 

 rib. The other Mustards, 4 inseparable from the genus 

 Brassica, are all characterized by a sessile siliqua, sub- 

 terete or tetragonal, with an often short rostrum, and 

 containing one or several globular seeds, or else asper- 

 mous. They are also European and Asiatic herbs. 5 

 The White Mustard 6 (fig. 237) has a fruit excep- 

 tional in the details from its form and size. Hence 

 it has been made into the genus Leucosinapis 7 which 

 we also regard as a mere section of the genus 

 Brassica. Its fruits are very spreading, oblong, 

 mammillated and prickly, with three prominent 

 anastomosing ribs on each valve ; they contain few 

 seeds, and are surmounted by a decurrent rostrum 

 longer than themselves, tapering only at the apex, 

 and usually a little falciform. 



Brassica (Leucosinapis) 

 alba (While mustard). 



Fig. 237. 

 Fruit. 



1 Mcench, Meth., 264 



2 Koch, Deutsch. FL, v. 713.— Ge.& Gode., 

 Fl. de Fr., i. 77. — Sinapis nigra L., Spec, 

 933.— S. incana Thuill., Fl. Par., 343.— #. 

 torulosa Pees. — S. turgida Pees. — S. villusa 

 Mb. 



3 M. communis Spenn., Fl. Frilurg. (ex 

 Spach, Suit, a Bvffon, vi. 377). 



4 L., Gen., n. 821.— Reichb., Ic. Fl. Germ., 

 ii. t. 85-88.— DC, Frodr., i, 217.— Bonnania 



Pkesl, Fl. Sic, i. 99. — Napus Schimp. & 

 Spenn., ex Koch, Syn. Fl. Germ., 55; ed. 2, 

 60 (ex E. H., Gen., 967, n. 77). 



5 Geen. & Gode., Fl. de Fr., i. 72. — Walp., 

 Rep., i. 186; Ann., i. 49; vii. 149. 



6 Sinapis alia L., Spec, 733. — DC., Fl. Fr., 

 iv. 645. — Geen. & Gode., Fl. de Fr., i. 74.— 

 S. foliata W. — Napus Leucosinapis Spenn. — 

 Leucosinapis alba Spach. 



7 Spach, Suit, a Bitffon, vi. 348. 



