Cypsela Development inAcourtia(Mutisieae, Nassauviinae, Asteraceae) and Its Taxonomic Implications

Cypsela Development inAcourtia(Mutisieae, Nassauviinae, Asteraceae) and Its Taxonomic Implications

In the search for taxonomic characters to infer the phylogeny ofAcourtia, cypsella development was studied for two species, caulescentAcourtia mexicanaand scaposeAcourtia runcinata. Using field‐collected and herbarium material, the anatomy of the cypsella was also studied for ca. 50 otherAcourtiaspe...

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Bibliographic Details
Published in:International journal of plant sciences Vol. 163; no. 2; pp. 227 - 233
Main Author: Cabrera R., Leticia
Format: Journal Article
Language:English
Published: The University of Chicago Press 01-03-2002
Subjects:
Anatomy
Biological taxonomies
Embryos
Endosperm
Epidermal cells
Epidermis
Genera
Pericarp
Testa
Vascular bundles
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Summary:In the search for taxonomic characters to infer the phylogeny ofAcourtia, cypsella development was studied for two species, caulescentAcourtia mexicanaand scaposeAcourtia runcinata. Using field‐collected and herbarium material, the anatomy of the cypsella was also studied for ca. 50 otherAcourtiaspecies. A few species ofLophopappus,Perezia,Proustia, andTrixiswere also surveyed since, at different times, they have been proposed as genera closely related toAcourtia. The results of this study indicate that there are two distinct groups with different anatomical features withinAcourtia. The caulescent species group possesses from six to 10 vascular bundles within the pericarpal wall and, at maturity, a parenchymatic testa epidermis. The scapose species group possesses five vascular bundles within the pericarp and, at maturity, a sclerified testa epidermis.
ISSN:1058-5893
1537-5315
DOI:10.1086/338826