Leaf indumentum types in Potentilla (Rosaceae) and related genera in Iran

Marzieh B Faghir,Farideh Attar,Ali Farazmand,Barbara Ertter,Bente Eriksen

doi:10.5586/asbp.2010.019

Marzieh B Faghir, Farideh Attar + Show 3 more

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https://doi.org/10.5586/asbp.2010.019

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Abstract

Indumentum types of the leaves in 31 species of Potentilla L. (Rosaceae) and four related genera, especially Tylosperma Botsch., Schistophyllidium (Juz. ex Fed.) Ikonn., Drymocallis Fourr. ex Rydb., and Sibbaldia L. from Iran were investigated. Indumentum ultrastructure was studied by scanning electron microscopy (SEM). SEM observation revealed three type classes based on leaf indumentum: 1) straight (appressed-erect); 2) straight-erect and crispate, and 3) crispate-floccose. The straight hair character (I type class) is widely distributed among all genera sampled and six sections of Potentilla. In contrast the crispate-floccose indumentum (III type class) is confined to all examined species of sections Speciosae and Pensylvanicae. While some sections especially Rectae (straight and straight-crispate hairs) and Terminales (straight-crispate and floccose-crispate) posses two indumentum type classes. The present survey shows that indumentum types are of systematic importance and may form good key characters for identification purposes.

Highlights

The large, complex genus Potentilla L. (Rosaceae) consists of several hundred species, mostly herbaceous perennials distributed in arctic and temperate regions of the northern hemisphere
Schiman-Czeikas (1969) treatment of Potentilla, in the Flora Iranica reported 51 species of Potentilla arranged in 18 sections from Iran, Afghanistan, parts of western Pakistan, northern Iraq, Azerbaijan and Turkmenistan
Smith. and Sibbaldia L. in the area covered by Flora Iranica (Schiman-Czeika 1969)

Summary

Introduction

The large, complex genus Potentilla L. (Rosaceae) consists of several hundred species, mostly herbaceous perennials distributed in arctic and temperate regions of the northern hemisphere. In Iran species of Potentilla occur mainly in the northern, northwestern and southern parts of the country, on alpine meadows, rocky places, riverbanks, lakes, streams, pastures and roadsides (Schiman-Czeika 1969; Khatamsaz 1993). Schiman-Czeikas (1969) treatment of Potentilla, in the Flora Iranica reported 51 species of Potentilla arranged in 18 sections from Iran, Afghanistan, parts of western Pakistan, northern Iraq, Azerbaijan and Turkmenistan. Duchesnea Smith., Comarum L. and Sibbaldia L. were treated as separate genera. Subsequent changes to Schiman-Czeikas treatment, as compiled by Ertter and Attar (2007), resulted in 58 species of Potentilla L., three species of Drymocallis Fourr. Sibbaldia L. in the area covered by Flora Iranica (Schiman-Czeika 1969) Smith. and Sibbaldia L. in the area covered by Flora Iranica (Schiman-Czeika 1969)

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