38 FLOWERING PLANTS OF THE RIVIERA 



B. Erucastrum L. = Diplotaxis Erucastrum G.G. Leaves all pinnati- 

 partite, with oval, toothed segments, the two lower ones embracing the stem. 

 Sepals widely spreading. Flowers bright yellow. Stern rough, rather leafy. 

 Pods and pedicels spreading. 



Mountain region. June, July. Esterel, Grasse, Entraunes. 



DIPLOTAXIS DC. 



D. erucoides DC. White Rocket (Plate V). Annual, pubescent or al- 

 most glabrous. Stem 1-2 ft. high, branched from the base, leafy. Lower 

 leaves lyrate or sinuate-crenate and petioled ; stem-leaves sessile, oblong, 

 dentate. Pedicels rather longer than the loose and hairy sepals. Flowers large, 

 white, turning lilac as they fade. Siliqua 2-3 times length of pedicel. 



Cultivated ground. Very common, flowering all the year round, especially in 

 winter and early spring. Fields are often white with it, and though a pernicious 

 weed it is quite a pretty plant. 



D. tenuifolia DC. Fine-leaved Wall Mustard. A glabrous rather glaucous 

 plant 1-2 ft. high, liqueous at the base, very leafy. Lower leaves pinnatifid ; 

 upper ones entire or nearly so. Pedicels 2-3 times longer than the calyx, and 

 nearly as long as the pod. Flowers large, lemon-yellow. When rubbed the 

 plant emits a disagreeable smell. 



Old walls, ruins, and waste places, common. April, August. 



D. muralis DC. Sand Mustard. Annual or biennial, greener than the last 

 and slightly hairy. Stem almost naked, 6- 1 8 in. high. Leaves mostly radical, 

 petioled, pinnatifid or sinuate-dentate. Pedicels rather longer than the calyx 

 and a third length of pod. Flowers rather small, bright yellow. 



Fields and waste sandy places. April-August. Never seen by the writer in 

 any country on walls, as its name would imply. 



D. viminea DC. Annual, glabrous, green. Stems slender, almost naked. 

 Leaves mostly radical ; pinnatifid or sinuate. Pedicels equalling the glabrous 

 erect sepals, and about quarter length of pod. Flowers quite small, bright 

 yellow. 



Fields and waste places. April-July. Much less common than the 

 others. 



SINAPIS L. MUSTARD. 



S. Cheiranthus Koch. Annual or biennial,' bristly below. Stem 1-3 ft. 

 high, branched. Leaves petioled, pinnatifid, the upper ones with linear-lanceo- 

 late lobes. Flowers yellow, large. Sepals slightly longer than the pedicels. 

 Pods long, spreading, each valve with 3 strong nerves, glabrous. Beak long. 



Rocky hills and by-paths. May-July. 



S. arvensls L. Charlock. Annual plant, 1-2 ft. high, branched, hispid. 

 Lower leaves lyrate, upper ones oval or oblong, sinuate-dentate, sessile. Sepals 

 spreading. Flowers small, yellow. Pedicels thick, short. Pods spreading, 

 with hispid torulose valves, which are 3 ribbed. 



Common in arable fields. April-June. 



S. alba L. White Mustard. Plant annual, hispid with reflexed hairs, 

 1-2 ft. Upper leaves pinnatifid, all lyrate-pinnatifid or pinnate, segments 

 cut and lobed. Pods short, beaded, few seeded, valves scarcely equalling the 

 long broad beak, strongly 3 ribbed, concave. Flowers yellow. 



Fields and cultivated places, uncommon. April-June. Excluded by Burnat 

 as native for les Alpes-Marit. 



S. nigra L. Black Mustard. Plant annual, green, hispid at the base, 2-3 

 ft. high. Stem rigid, branched. Lower leaves lyrate, with large terminal lobe ; 

 stem-leaves linear lanceolate, entire or toothed, glabrous. Flowers small, 

 bright yellow. Pods subulate, 4 angled, glabrous, erect ; valves keeled, torulose, 

 i nerved. Beak slender and short. 



Fields and waste places. May-July. 



