[Plant-education] Re: fava bean seed/epidermal peels

David R. Hershey dh321 at excite.com
Fri Feb 3 21:56:34 EST 2006

The orange structures on the Plectranthus (Swedish ivy) leaves are
probably peltate glandular trichomes. The first article below notes
that peltate trichomes in Plectranthus ornatus have "an uncommon but
characteristic orange to brownish colour." Figure 4L has a color photo.

Ascensao, L., Mota, L., and Castro, M. de M. 1999. Glandular trichomes
on the leaves and flowers of Plectranthus ornatus: Morphology,
distribution and histochemistry. Annals of Botany 84: 437-447.

Gersbach, P.V. 2002. The essential oil secretory structures of
Prostanthera ovalifolia (Lamiaceae). Annals of Botany 89: 255-260.

Turner, G.W., Gershenzon, J. and Croteau, R.B. 2000. Distribution of
peltate glandular trichomes on developing leaves of peppermint. Plant
Physiol. 124(2): 655-664.

Below are some other plants recommended for epidermal peels in student

1. Commelinia communis:


2. Zebrina pendula:


3. Ficus elastica:

Valenzuela, JL 1998. Ficus epidermal structures: A tool for introducing
leaf anatomy. Amer. Biol. Teacher 60:216-219.

4. Tradescantia:


5. Monstera:


David R. Hershey

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