Collinsonia verticillata Bald. ex Ell. - Whorled Horsebalm

Collinsonia verticillata plant

Family - Lamiaceae






Collinsonia verticillata inflorescence


Collinsonia verticillata calyxCalyx.

Collinsonia verticillata flower

Flowering - April - June.

Habitat - Wooded slopes, deciduous woods.

Origin - Native to North America.

Other information - This attractive species is uncommon in Alabama and can be found in just a handful of southern counties. The plant can be identified by its large opposite leaves. The nodes of the upper stem are very close together and give the leaves a whorled appearance. Any other than the upper four leaves are typically much reduced or absent all-together. The large inflorescences can get branched with age and the frilly white flowers are quite striking.
The genus name, Collinsonia, is named for Peter Collinson (1694 - 1768). Collinson was the Royal Botanist of King George III and an important friend and influence of the great American botanist, John Bartram.
The species epithet verticillata derives from the Latin "verticill(a)" meaning "a whorl" referring to the leaves.

Alabama Distribution:

Collinsonia verticillata map

Photographs taken at Tuskeegee National Forest, AL., 10-9-04.

Thumbnail Page

Species List