JOURNAL OF THEARNOLD ARBORETUMVOLUME 66 JULY 1985 NUMBER 3 THE GENERA OF BRASSICEAE (CRUCIFERAE; BRASSICACEAE) IN THE SOUTHEASTERN UNITED STATES'2 IHSAN A. AL-SHEHBAZ Tribe Brassiceae [A. P. de Candolle, Syst. Nat. 2: 152. 1821.] Annual, biennial, or perennial herbs [sometimes subshrubs or shrubs], un-armed [rarely spiny], glabrous or with simple trichomes only. Inflorescenceusually an ebracteate corymbose raceme, often greatly elongated in fruit; flowersfew to many [rarely solitary]. Sepals erect or spreading, saccate at base or not.Petals usually obovate, clawed. Stamens 6; filaments without [very rarely with]a basal appendage. Median nectar glands present or absent. Stigmas entire or2-lobed, the lobes sometimes decurrent. Siliques usually differentiated intolower (valvular) and upper (beak) segments, sometimes transversely jointedand breaking into parts, occasionally lomentaceous [or samaroid or nutlike], 'Prepared for the Generic Flora of the Southeastern United States, a long-term project made possi-ble by grants from the National Science Foundation and at this writing supported by BSR-8 111520(C. E. Wood, Jr.. principal investigator). under which this research was done, and BSR-8303100(N. G. Miller, principal investigator). This account, the 108th in the series, follows the format estab-lished in the first paper (Jour. Arnold Arb. 39: 296-346. 1958) and continued to the present. Thearea covered by the Generic Flora includes North and South Carolina, Georgia, Florida, Tennessee,Alabama, Mississippi, Arkansas, and Louisiana. The descriptions are based primarily on the plantsof this area, with information about extraregional members of a family or genus in brackets [ ]. Thereferences that I have not verified are marked with asterisks. I am most grateful to Carroll Wood for his continuous advice and help during the preparation of this paper, and particularly for his critical review of the manuscript. I am indebted to Norton G. Miller, George K. Rogers, and Cesar G6mez-Campo, as well as to Barbara Nimblett for the typing of the manuscript. I am grateful to Elizabeth B. Schmidt and Stephen A. Spongberg for their editorial advice. The illustrations were made by Karen Stoutsenberger (Fu;(.i I) and Rachel A. Wheeler (FirmiRi 2) under earlier grants. 2For an account of the family and its tribes, see Al-Shehbaz, The tribes ofCruciferae (Brassicaceae) in the southeastern United States. Jour. Arnold Arb. 65: 343-373. 1984.� President and Fellows of Harvard College, 1985.Journal of the Arnold Arboretum 66: 279-351. July, 1985.