30 SPRING FLORA 



Fruit long-linear, 1-4 inches 



long 12. Caul ant h UK 



Fruit linear (1 inch long or less). 

 Flowers yellow or white; pods 



spreading 11. Sisymbrium 



Flowers pink or purple; pods 



erect 13. Thelypodium 



Fruit 4 -angled. 



Flowers yellow; none of the leaves 



clasping 14. Erysimum 



Flowers yellowish-white; upper leaves 



clasping 15. Courlngia 



Fruit distinctly beaked. 



Beak long; seeds in 1 row; silique 



terete 16. Brassica 



Beak very short; seeds in 2 rows, silique 



flat 17. Diplotaxis 



1. LEPIDIUM. Pepper-Grass. 



Mostly homely herbs. Stems usually much-branched. 

 Flowers usually in dense racemes; white, greenish or rarely 

 yellow; on slender pedicels, without bracts; mostly incon- 

 spicuous. Petals small or none. Stamens tetradynamous. or 

 sometimes 4 or only 2. Silique small; notched at apex; roundish 

 in outline; strongly flattened at right angles to the partition; 

 each of its cells 1 -seeded. 



Stamens 6; tetradynamous. 

 Upper leaves clasping. 



Petals yellow; style none 1. L. perfoliatum 



Petals white; style conspicuous 2. L. Draba 



None of the leaves clasping 3. L. montanum 



Stamens 4 or 2. 



Petals white, longer than sepals. 



Petals broadly spatulate 4. L. virginicum 



Petals narrowly spatulate 5. L. medium 



Petals minute or none. 



Siliques emarginate or retuse at apex. 

 Siliques glabrous. 



Stem simple at base 6. L,. apetalum 



Stem divergently branched from 



base 7. L.. divergens 



Siliques pubescent. 



Stem hirsute 8. L. lasiocarpum 



Stem puberulent 9. L. pubecarpum 



Siliques toothed or lobed at apex 10. Ii. dictyotnm 



1. L.. perfoliatum L.. Annual. 6-12 inches high. Stem simple 

 below, branched above. Lower leaves 5 inches or less in 

 length, petioled; pinnate, the subsessile divisions again pinnate, 

 but becoming less and less so upward on the stem until they 

 are entire and clasping the stem by the sagittate or finally 

 cordate base. Flowers very small, on slender reddish pedicels. 

 Pods round, barely notched. In waste places. April-June. 



