MUSTAKD FAMILY. 59 



$ 1. Fruit a true pod, opening lengthwise by two valves, which/all away and leave the 

 thin, persistent partition when ripe. 



* Pod flattened parallel to the partition; the seeds flat or flattish; seed-leaves edgewise 



to their stem. 

 t- Pod broadly oblong or oval, large and very flat; seeds 2-4 in each cell in 'i rows. 



1. LUNAEIA. Seeds winged. Large pod stalked In the calyx. .Flowers purple, rather 



£«• -i- -i- Pod oblong or linear ; seeds in 1 row. 



■h- Valves nerveless. 



2. LEAVENTVORTHIA. Stems scape-like, 1-few-flowored. Seeds winged. Small 



annuals. 



3. DENTAEIA. Stems naked Mow, 2-8-leaved above, from a horizontal, fleahy, scaly root- 



stock. Seeds wingless. 



4. CARD AMINE . Stems leafy, from a fibrous root, or at least not from a scaly roo tstock. 



Seeds wingless. ^ ^ Va i ves wit j a prominent midrib. 



5. MATTHIOLA. Stigma deeply 2-lobed. Seeds as broad as the partition, winged. 



Flowers large and showy, white to purple. 



6. ABABIS. Stigma only slightly, or not at all, 2-lobed. Seeds winged or margined. 



4-4-4- Pod linear, oblong, or even round-oval, but the seeds in 2 rows. [See, also, 

 i Arabis.] 



7. DRAB A. Seeds wingless, numerous. Pods flat, various in shape. Flowers small and 



(in ours) white. 



8. ALTS8UM. Seeds winged, 2-4. Pods flat, roundish. Flowers small, yellow or white. 



* * Pod globular, or cylindric, or i-anyled by the prominent mid-nerves; seeds wing- 



less. \_Matthiola may be sought here.] 



+- Pod globular or cylindric. 



++ Valves nerveless ; cotyledons accumbent. (Lessons, Figs. 425, 426.) 



9. LESQUEEELLA. Pod about 4-seeded. Low, hoary plants with mostly yellow, 



small flowers. , 



10. AUBRIETIA. Pod many-seeded. Stronger, hoary, with purple, rather large flowers. 



11. NASTURTIUM. Pod many-seeded. Aquatic or marsh plants, hairy or smooth, and 



small yellow or white flowers. 



++ -H- Valves nerved; cotyledons incumbent. (Lessons, Figs. 427, 428.) 



12. OAMELIKA. Pod turgid, obovate, or pear-shaped. Weed, usually in flax. 



+■ +- Pod linear. 



4+ Cotyledons accumbent. 



(11. NASTURTIUM.) Valves nerveless. Marsh or aquatic plants. 



IS. CHEIEANTHUS. Talves with a strong mid-nerve. Lateral sepals sac-like at base. 



Leaves entire and flowers showy. 



14. BAEBAEEA. Talves with strong mid-nerve. Sepals nearly equal and alike. Leaves 



lyrate or pinnatifid. 



■h- 44- Cotyledons incumbent. (Lessons, Figs. 42T, 428.) 

 = Flowers purple or rose-colored, or, if white, large. 



15. HE8PEEIS. Stigma with 2 erect blunt lobes. Flowers pink-purple. Hairs glandular. 



16. MALCOLMIA. Stigma with 2 pointed lobes. Hairs glandless. 



17. THELTPODIUM. Stigma entire. 



— — Flowers yellow, or, if white, very small. 



18. EETSIMUM. Stigma rather large and 2-lobed. Leaves simple. 



19. SISYMBRIUM. Stigma small and entire. Leaves twice pinnatifid. 



Cotyledons conduplicate. 



20. BBASSIOA. Pod more or less beaked. Flowers yellow. 



