Pericarp Structure and Phylogeny of the Phlomis Group (Lamiaceae Subfam

Bot. Jahrb. Syst. 127 3 299–316 Stuttgart, published online

Pericarp structure and phylogeny of the Phlomis group (Lamiaceae subfam. Lamioideae)

Olof Ryding

With 4 figures and 1 table

Abstract

Ryding, O.: Pericarp structure and phylogeny of the Phlomis group (Lamiaceae subfam. Lamioideae). — Bot. Jahrb. Syst. 127: 299–316. Published online July 2008. — ISSN 0006-8152.

Pericarp structure has been investigated in 52 species belonging to the closely related genera Phlomis s. lat. (incl. Phlomoides), Eremostachys, Lamiophlomis and Notochaete. The new data supports the division of the Phlomis group into two main groups: 1) a group of Phlomis sect. Phlomis; 2) a group of Eremostachys, Notochaete, Lamiophlomis and Phlomis sect. Phlomidopsis. The data also supports Eremostachys (including E. sect. Phlomoides) as a monophyletic subgroup within the second group. Other variations in pericarp structure largely match the infrageneric classifications of Eremostachys and Phlomis sect. Phlomis. In combination with earlier known morphological and molecular data, the new results suggest that the Phlomis group may be divided into the following three genera: Phlomis s. str., Phlomoides (= P. sect. Phlomidopsis, Notochaete and Lamio- phlomis) and Eremostachys. The biological significances of some pericarp structures are discussed.

Keywords: pericarp, nutlets, anatomy, phylogeny, Phlomis, Eremostachys, Phlomoides, Lamiophlomis, Notochaete, Lamioideae, Lamiaceae.

Introduction

The genera Phlomis, Eremostachys, Notochaete and Lamiophlomis are com- monly regarded as closely related. They resemble each other in usually possessing

Received July 18, 2007, in revised form December 17, 2006, accepted December 19, 2007