CRUCIFERAE. 



[VOL. II. 



i. Neslia paniculata (L,. ) Desv. Neslia. 

 (Fig. 1754.) 



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

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



Slender, branched above, rather densely rough- 

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

 per linear-lanceolate, acute or obtusish at the 

 apex, sagittate-clasping at the base, I'-zJ^' long, 

 2' / -8 // wide; racemes elongated; flowers yellow, 

 nearly \" broad; pedicels filiform, ascending, 

 3 // -5 // long in fruit; silicles globose, or slightly de- 

 pressed, about i" in diameter, finely reticulated. 



In waste places, Ontario, Manitoba and British Co- 

 lumbia, and in ballast about the eastern seaports. 

 Adventive or fugitive from Europe. May-Sept 



Rapistrum rug6sum(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 

 near! 



.iu\.3, ii. i^ uw luuuu ua a wan ai I..I>KMI, r dill., 



plentifully in ballast about the seaports. It is 

 rly related to Raphanus. 



29. DRABA L. Sp. PI. 642. 1753. 



Low tufted mostly stellate-pubescent herbs, with scapose or leafy stems, simple leaves, 

 and mainly racemose flowers. Silicles elliptic, oblong or linear, flat, few to many-seeded. 

 Stigma nearly entire. Seeds wingless, arranged in 2 rows in each cell of the pod, numerous; 

 valves dehiscent, nerveless; cotyledons accumbent. [Greek name for some plant of this 

 family.] 



Species about 150, mainly natives of the north temperate and arctic regions, a few in southern 

 South America. Besides the following, some 25 others are natives of western North America. 

 Flowers white. 



Petals deeply 2-cleft. 



Petals entire, toothed, or emarginate. 



Flowering stems scapose, leafy only below. 

 Plants annual, not arctic. 



Leaves entire, obovate or oblong. 

 Leaves dentate, cuneate. 

 Low arctic perennials. 



Leaves stellate-canescent. 

 Leaves pilose-ciliate or glabrous. 



Flowering stems leafy throughout up to the inflorescence. 

 Leaves entire or sparingly dentate. 



i />. rerna. 



2. D. Caroliniana. 



3. D. cunei/olia. 



4. D. Fladnizensis. 



5. D. nivalis. 



Leaves sharply dentate. 

 Flowers yellow; stems leafy. 

 Pods oblong, i"-a" long. 

 Pods linear or lanceolate, 3"-6" long. 



Annual; pods 3" -4" long; pedicels divaricately spreading. 

 Perennial; pods 4" -7" long; pedicels erect. 

 Flowers yellow; stems scapose. 



i. Draba v6rna L,. Vernal Whitlow -grass. 

 (Fig. 1755.) 



Draba verna L. Sp. PI. 642. 1753. 



Erophila vulgaris DC. Syst. Veg. a: 356. 1821. 



Annual, the leafless flowering stems (scapes) numerous, 

 i '-5' high, erect or ascending, arising from among a tuft 

 of basal leaves, which are oblong or spatulate-oblanceo- 

 late, X /-I/ l n gi dentate or nearly entire, acutish and pu- 

 bescent with stiff stellate hairs; scapes nearly glabrous; 

 flowers white, i^ // -2 // broad; petals deeply bifid; pedicels 

 ascending, Yz f -\ f long in fruit; racemes elongating; pods 

 oblong, glabrous, $"-4," l n g i" broad, obtuse, shorter 

 than their pedicels; style minute; seeds numerous. 



In fields, common throughout our district except the ex- 

 treme north. Naturalized from Europe. Occurs also in Brit- 

 ish Columbia. Native of Europe and western Asia. Feb.-May. 



6. /'. incana. 



-. n. ramosissima. 



8. D. brachycarpa. 



9. D. nemorosa. 

 10. D. aurea. 



n. />. alpina. 



