Physostegia  

Physostegia is a genus of flowering plants in the family Lamiaceae, native to North America (United States, Canada, northern Mexico).^[1][2] They are erect rhizomatous herbaceous perennials inhabiting damp, sunny places. They grow up to 2 m (7 ft) tall with purple or pink tubular flowers in racemes in summer.^[3]

The generic name comes from two Greek words, physa (a bladder) and stege (a covering), referring to the calyx, which becomes full of fruit when mature.^[4]

Physostegia virginiana is the most common species, and is known as "obedient plant".

Species^[1]

1. Physostegia angustifolia Fernald - lower Mississippi Valley, southern Great Plains
2. Physostegia correllii (Lundell) Shinners - Texas, northern Mexico
3. Physostegia digitalis Small - Texas, Louisiana, Arkansas, Alabama
4. Physostegia godfreyi P.D.Cantino - Florida Panhandle
5. Physostegia intermedia (Nutt.) Engelm. & A.Gray - lower Mississippi Valley, southern Great Plains
6. Physostegia ledinghamii (B.Boivin) P.D.Cantino - Northwest Territories, Alberta, Saskatchewan, Manitoba, North Dakota
7. Physostegia leptophylla Small - Southeast from Florida to Virginia
8. Physostegia longisepala P.D.Cantino - Texas, Louisiana
9. Physostegia parviflora Nutt. ex A.Gray - western Canada (Manitoba to British Columbia), northwestern + north-central United States (Illinois to Washington)
10. Physostegia pulchella Lundell - eastern Texas
11. Physostegia purpurea (Walter) S.F.Blake - Southeast from Florida to North Carolina
12. Physostegia virginiana (L.) Benth. - much of eastern + central US + Canada; northeastern Mexico

References[edit]

University of Texas Herbarium