GENUS 10. 



MUSTARD FAMILY. 



i. Neslia paniculata (L.) Desv. Ball Mus- 

 tard. Fig. 2024. 



Myagrum paniculatum L. Sp. PI. 641. 1753. 

 Neslia paniculata Desv. Journ. Bot. 3: 162. 1814. 



Slender, branched above, rather densely rough- 

 hispid, i-2 high. Leaves lanceolate, or the upper 

 linear-lanceolate, acute or obtusish at the apex, 

 sagittate-clasping at the base, \'-z\' long, 2"-8" 

 wide; racemes elongated; flowers yellow, nearly i" 

 broad; pedicels filiform, ascending, 3"-5" long in 

 fruit; silicles globose, or slightly depressed, about i" 

 in diameter, finely reticulated. 



In waste places, Quebec to Manitoba, North Dakota, 

 British Columbia and Pennsylvania, and in ballast about 

 the eastern seaports. Adventive or fugitive from Eu- 

 rope. May-Sept. 



Rapistrum rugosum (L.) All., a plant with 2-jointed 

 indehiscent pods, erect on appressed pedicels, in long 

 racemes, has been found as a waif at Easton, Penn., 

 and plentifully in ballast about the seaports. It is re- 

 lated to Raphanns. 



ii. SUBULARIA L. Sp. PI. 642. 1753. 



Small annual aquatic submerged herbs, with basal linear 

 subulate leaves, and minute racemose white flowers. Silicles 

 short-stipitate, globose to oblong or elliptic, the valves con- 

 vex, i-ribbed on the back, the partition broad. Stigma sessile, 

 entire. Seeds few, in 2 rows in each cell, marginless. Coty- 

 ledons narrow, incumbent, curved above their base. [Latin 

 awl, from the awl-shaped leaves.] 



A monotypic genus of the northern hemisphere. 



i. Subularia aquatica L. Water Awl wort. Fig. 2025. 



Subularia aquatica L. Sp. PI. 642. 1753. 



Tufted, glabrous, i'-4' high, growing on the margins and 

 bottoms of lakes in shallow water. Flowering scape simple, 

 lateral, i'-3$' high; leaves nearly cylindric, 6"-i5" long; flow- 

 ers few, racemose, distant; pedicels slender, i"-3" long in 

 fruit; petals white, minute; pods i"-ij" long. 



In clear, cold lakes, Newfoundland to British Columbia, Maine, 

 New Hampshire and Ontario, south in the Rocky Mountains to 

 Wyoming, and to California. Also in Europe and Siberia. June- 

 Sept. 



12. RADICULA Hill, Brit. Herb. 265. 1756. 



[RbRiPA Scop. Fl. Cam. 520. 1760.] 



[NASTURTIUM R. Br. in Ait. Hort. Kew. Ed. 2, 4: 109. 1812.] 



Branching herbs, with simple or pinnate lobed dissected or rarely entire leaves, and small 

 yellow flowers. Sepals spreading. Stamens 1-6. Pods short, terete or nearly so. Stipe 

 none. Valves nerveless or i-nerved. Style short or slender. Stigma 2-lobed or nearly 

 entire. Seeds turgid, minute, in 2 rows in each cell or very rarely in I row. Cotyledons 

 accumbent. [Name Latin, diminutive of radix, root.] 



About 50 species, of wide geographic distribution, most abundant in the north temperate zone. 

 Besides the following, there are about 12 other North American species, natives of the southern and 

 western parts of the continent. Type species : Sisymbrium amphibium L. 

 Flowers and pods distinctly pedicelled ; pods smooth or nearly so. 

 Plants perennial by creeping or subterranean branches. 



Leaves pinnately divided ; style very short ; naturalized European species, i. R. sylvestris. 

 Leaves pinnatifid ; style slender ; native western species. 2. R. sinuata. 



Plants annual, biennial or perennial, with fibrous roots. 

 Fruiting pedicels \"-z" long; stem diffuse. 



Pods linear to oblong, 3" -5" long. 3. R. obtusa. 



Pods subglcbose, about i" in diameter. 4. R. sphaerocarpa. 



Fruiting pedicels 2" -4" long ; stem erect. 



Stem nearly or quite glabrous ; pods linear or linear-oblong. 5. R. palustris. 



Stem hispid-pubescent; pods globose or oval. 6. R.hispida. 



Flowers and pods very nearly sessile. 7. R. sessiliflora. 



