CBUGIFEB^. 



229 



times elongated racemes ; pedicels ebracteate or bracteate 1 {Temperate 

 regions in both Worlds"). 



5. Arabis L. 3 — Sepals usually rather short, equal at base, or 

 lateral saccate at base. Petals equal entire, usually unguiculate. 

 Stamens 6, 4-dynamous. Siliqua sessile elongated, thin, linear, com- 

 pressed ; style usually short or next to none ; stigmatiferous apex 

 simple or 2-lobed ; valves flat keeled or ribbed, sometimes fleshy 

 (Stevenia), 4 more rarely marked by oblique crowded ribs between keel 

 and edge {FaUrfan din a) ; 5 septum membranous. Seeds go, ].- or very 

 rarely 2-seriate (Turrtis,* Falklandina), more rarely few (Stevenia), 

 compressed, marginate winged or immarginate ; embryo somewhat 

 fleshy ; cotyledons usually accumbent :• — -Herbs, annual or perennial, 

 glabrous or stellate-tomentose with furcate hairs, or hoary ; radical 

 leaves usually spathulate ; cauline sessile ; flowers 7 in ebracteate 

 racemes (All Temperate, Alpine and Frigid regions*). 



6. Streptanthus Nutt. 9 — Sepals usually petaloid, either equal 

 at base, or 2 or 4 saccate at base, broadly imbricate. Petals 

 unguiculate ; claw straight or twisted. Stamens 6 ; filaments usually 

 surrounded by somewhat thick glands at base ; the longer often 

 connate in pairs to a greater or less distance. Siliqua sessile, com- 

 pressed or sub-4-gonous, narrow or wide ; valves nearly flat, 1 -ribbed ; 

 septum hyaline, occasionally shining ; apex of style stigmati- 



1 A genus not easy to distinguish from Nas- 

 turtium, differing chiefly in its " robuster habit, 

 more rigid siliqua, with carinate valves and 1- 

 seriate seeds." (B. H., loc. cit.) 



2 Spec, about 20. Reickb., Ic. Fl. Germ., ii. 

 t. 47-19. — Gren. & Godr., Fl. de Fr., i. 90.— 



A. Gray, Gen. III., t. 62. — A. Met., Midd. Sib. 

 Reis., i. 2, 14. — Reg. & Til., Fl. Ajan., 45, in 

 Mem. Mosc. (1859), xi. — Boiss., Fl. Or , i. 

 183.— Walp., Rep., i. 12S ; ii. 755 ; v. 34 ; 

 Ann., i. 27; vii. 101. 



3 Gen., n. 818.— J., Gen., 238.— R. Dr., in 

 Ait. Sort. Ketv., ed. 2, iv. 104. — DC, Prodr., i. 

 142.— Spach, Suit, a Buffmi, vi. 436.— Endl., 

 Gen., n. 4854. — Hook. p. & Thoms., in Journ. 

 Linn. Soc, v. 140. — A. Gray, Gen. III., t. 58. — 



B. H., Gen., 69, n. 9. — Arabidium Spach, loc. 

 cit., 436. 



4 Ad. & Fiscn., in Ledeb. Fl. Ross.,\. 123. — 

 DC, Prodr., i. 141. — Endl., Gen., n. 4855. 



5 The type of this subgenus is A.falklandica 

 Hook., whose siliqua has rigid carinate valves. 



6 L., Gen., 819.— DC, Prodr.. i. 141.— Endl., 

 Gen., n. 4853.— A. Gray, Gen. III., t. 59. 



7 White, straw-coloured, pink, or purplish. 



8 Spec, about 60 (as many as 130 given by 

 authors). Reichb.,7c. Fl. Germ., ii. t. 33-44. — 

 Deless., Ic. Sel., ii. t. 20, 21. — Gren. & Godr., 

 Fl. de Fr., i. 99.— Boiss., Fl. Or., i. 165. — 

 Hary. & Sond., Fl. Cap., i. 22. — Walp., Rep., 

 i. 129 (Turri/is), 130; ii. 756; v. 34; Ann., i. 

 28 ; ii. 34 ; v. 193 ; vii. 101. 



9 Nutt., in Journ. Acad. Philad., v. 134, t. 

 7. — Torr. & Gr., Fl. N.-Amer., i. 75. — A. 

 Gray, Gen. III., t. 60, 61. — Endl., Gen., n. 

 4852.— B. H., Gen., 69, 966, n. 12. 



