VI. Subfam. Lamioideae Harley (2003)
Subfam. Stachyoideae (Dumort.) Luerss. (1882); Briq. in Engl. & Prantl (1895) et auct. mult., p.p., typ. incl.
Subfam. Prasioideae (Benth.) Thomé (1889)
Subfam. Pogostemonoideae P.D. Cantino, Harley & Wagstaff in Harley & Reynolds (1992).
Rhizomatous perennial herbs, glabrous or subglabrous below inflorescence, hairs simple; leaves mostly sessile, often amplexicaul, the lowest sometimes petiolate; inflorescence racemoid, flowers subsessile; bracteoles absent; calyx actinomorphic, somewhat inflated in fruit, 5-lobed, lobes equal; corolla strongly 2-lipped, 4-lobed (1/3), white to reddish violet, posterior lip flat to slightly hooded, usually entire or emarginate, tube exannulate; stamens equal or anterior pair longer, filaments villous, thecae parallel, not confluent, suture bordered with 1-6 (-10) small teeth; disc with abaxial lobe equal to twice as long as ovary; stigma-lobes equal to subequal; nutlets trigonous, glabrous, smooth or rarely verrucate. 2n = 38, 76. Twelve species, northern Canada to northern Mexico. Physostegia virginiana (L.) Benth. is widely grown as an ornamental and sometimes naturalized elsewhere. With a base number of 19, Physostegia is probably of amphiploid origin from parents with n = 9 and 10 (Cantino 1985b). One parent may be Warnockia (n = 10), the genus with the closest phenetic relationship to Physostegia (Cantino 1982). The other parent is presumably extinct.
Native to:70 Subarctic America71 Western Canada72 Eastern Canada73 Northwestern U.S.A.74 North-Central U.S.A.75 Northeastern U.S.A.76 Southwestern U.S.A.77 South-Central U.S.A.78 Southeastern U.S.A. 79 Mexico
PublicationPhysostegia Benth., Edward's Bot. Reg. 15: sub t. 1289 (1829); Cantino, Contr. Gray Herb. 211: 1-105 (1982).
Species found in RBG Kew living collections
2004-2817 Physostegia virginiana 'Summer Spire' PERH 133 04 1994-2775 Physostegia virginiana Benth. 111 10 : 111 21 1969-33862 Physostegia virginiana Benth. F 751 HPG-E
© Royal Botanic Gardens, Kew