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Platananthus synandrus
Taxonomy
Platananthus synandrus was named by Manchester (1986). It is the type species of Platananthus.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1986 | Platananthus synandrus Manchester |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Platananthus synandrus Manchester 1986
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| S. R. Manchester 1986 | Globose staminate heads borne in helical arrangement on axes >12 cm long (longest specimen incomplete) with at least 10 sessile heads 3.5-8.0 mm in diameter. Head composed of a receptacular core 2.5-3 mm in diameter surrounded by numerous staminate florets, each with a whorl of five stamens, surrounded by a prominent perianth. Stamens have elongate anthers (0.9-2.2 mm long) with lateral dehiscence, sessile or on very short filaments and elongate, conical peltate connectives. Four pollen sacs per anther, 1.5-2 mm long. Connectives parenchymatous, except for a central vascular strand and well-cutinized epidermis. Numerous hairs arising from the connective epidermis and intertwining with those of adjacent connectives so that the five stamens of each floret are united and shed as five stamen units after pollen dehiscence. Perianth well developed and enclosing each floret prior to anthesis, with numerous (ca. 15-25) free strap shaped tepals in apparent spiral arrangement, 0.4-0.7 mm wide and 2.5-3.0 mm long. in situ pollen is tricolpate and prolate, 12-16 μm long, 10-14 μm equatorial diameter. Exine finely reticulate, tectate columellate. Tectum 0.2-0.3 μm thick, composed of elements that are triangular in longitudinal section. Foot layer 0.6-0.4 μm thick. Endexine no preserved.
Pollen reticulate,, and small, 11-16 μm polar length, 8-14 μm. |