| Summary: | 碩士 === 國立中興大學 === 生命科學系所 === 94 === The purpose of this research is to clarify and construct inflorescence model of six species in tribe Scirpeae (Cyperaceae) by observing different stages of inflorescence development. The six species include Bolboschoenus planiculmis, Eleocharis dulcis, Fimbristylis cymosa, Fuirena umbellate, Schoenoplectus validus and Schoenoplectus mucronatus. The inflorescence of tribe Scirpeae is composed mainly of bracts, paracladium and spikelets. Paracladia, extended or not, grow axiallary from the node of bract or prophyll. Paracladia consist of prophyll, second order paracladium or spikelets. The spikelet is composed of units of one glume with one bisexual floret, that are spirally or imbricately arranged. There are three inflorescence types found in this research : (1) Solitary spikelet, found in B. planiculmis and E. dulcis. (2) Pseudolateral capitate, found in Sch. mucronatus, with reduced paracladium but no prophylls, and a third order paracladia is present at lower branches of the inflorescence. (3) Anthelodium found in F. cymosa, Fu. umbellate and Sch. Validus, with elongated paracladium, and cladoprophylls at base of the inflorescence branches. Also, fourth or fifth order paracladium is present at lower branches. At the base of B. planiculmis inflorescence, the bracts are present in pairs. The glumes at the base of spikelets in E. dulcis, F. cymosa, Fu. umbellate, Sch. validus and Sch. mucronatus are often solitary, without floret. Occasionally there are undeveloped florets basal of spikelet of B. planiculmis, F. cymosa, Sch. validus and Sch. Mucronatus. Stamens of a few florets basal of spikelet of Sch. validus and Sch. mucronatus. are often all (or partially) aborted.
|
|---|
