200 SYSTEMATIC BOTANY. 



i. L. VIRGINICUM (Wild Pepper grass). Stem erect, branching, smooth; 

 leaves linear-lanceolate, dentate, acute, smooth ; flowers minute, white, in 

 terminal racemes ; silicle orbicular, not winged. In dry soil, about i foot 

 high. Leaves with peppery taste, like the garden peppergrass. June- 

 October. 



3. Alyssum.Calyx equal at base. Petals entire. Stamens 

 toothed. Silicle orbicular, or oval, with valves flat, or convex in the 

 center. y. 



i. A. MARITIMUM (Sweet Alyssuni). Stem suffruticose and procum- 

 bent ; leaves linear-lanceolate, hoary ; flowers small, white, fragrant ; pods 

 oval, smooth. Gardens. June-October. 



4. Lunaria. Sepals somewhat bi-saccate at base. Petals nearly 

 entire. Silicles pedicellate, elliptical, or lanceolate. Valves flat. @ y 



i. L. BIENNIS (Honesty). Pubescent ; stem erect ; leaves cordate, with 

 obtuse teeth ; flowers lilac ; silkies oval, obtuse at both ends. A garden 

 plant, 3-4 feet high. May- June, (f; 



5. Iberis. The two outside petals larger than the two inner. 

 Silicles compressed, emarginate ; cells i -seeded. 



i. I. UMBELLATA (Purple Candy-tuff). Stem herbaceous, smooth ; 

 leaves linear-lanceolate ; lower ones serrate ; flowers purple, terminal, in 

 simple umbels ; silicles acutely 2-lobed. A common garden plant, i foot 

 high. June-July. 



6. Barbarea. Sepals nearly equal at base. Silique 4-sided ; 

 valves concave. Seeds in a single series. (2) y. 



i. B. VULGARIS ( Winter Cress). Stem smooth, branching above ; lower 

 leaves lyrate ; upper ones obovate, pinnatifid at base, crenate ; flowers small, 

 yellow, in terminal racemes ; siliques obtusely 4-angled, slender. Brook- 

 sides and damp fields ; 1-2 feet high, dark green. May June. 



7. Arabis. Sepals erect. Petals entire, with claws. Silique 

 linear, valves i-nerved in the middle. Seeds in a single row in each 

 cell. 



i. A. HIRSUTA. Plant hairy, erect, 1-2 feet high ; leaves arrow-shaped ; 

 flowers small, greenish white ; pods upright. Rocky places. May. 



8. Cardamine. Calyx spreading. Silique linear. Valves flat, 

 veinless, opening elastically. Seeds ovate, with slender stalks, y. 



1. C. HIRSUTA (Bitter Cress). Stem erect, branching; leaves pinnate 

 pinnatifid ; flowers small, white, racemose ; silique long, slender, erect, 

 tipped with a short style. A variable, dark-green plant, common in wet 

 grounds. June. 



2. C. RHOMBOIDA. Stem upright, from a tuber ; flowers white or pur- 

 ple ; leaves toothed, and lower ones heart-shaped. Wet places. April- 

 May. 



