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Tetradymia

Tetradymia
Family: Asteraceae
Tetradymia image
Bob Beatson
  • FNA
  • Resources
John L. Strother in Flora of North America (vol. 20)
Shrubs, mostly 30-200 cm. Stems 1-5+, erect to spreading (tomentose to pannose or glabrous, often spiny). Leaves (usually with fascicles of secondary leaves in axils of the primary; primaries sometimes becoming spines) cauline; alternate; sessile (or obscurely petiolate); blades obscurely palmately nerved (usually 1-nerved), linear to filiform, narrowly lanceolate, or oblanceolate, margins entire, faces glabrous or lanate to tomentose, sometimes glabrescent. Heads discoid, (1-3) in distil axils or (3-8) in corymbiform clusters. Calyculi 0. Involucres turbinate to cylindric or hemispheric, 3-10+ mm diam. Phyllaries persistent, 4-6 in 1-2 series, erect, distinct, mostly oblong to ovate or lanceolate, equal or subequal, margins obscurely scarious. Receptacles flat, foveolate, epaleate. Ray florets 0. Disc florets 4-9, bisexual, fertile; corollas cream to bright yellow, tubes longer than funnelform or abruptly dilated throats, lobes 5, recurved, linear to lanceolate; style branches stigmatic in 2 lines, apices usually truncate to rounded-truncate, sometimes truncate-penicillate (appendages essentially 0). Cypselae prismatic to obconic or fusiform, obscurely 5-ribbed, glabrous or hirsute to densely pilose (hairs often obscuring pappi); pappi 0 or of 70-150 bristles or of 20-30, white to stramineous, subulate to setiform scales. x = 30.
Species within checklist: Arizona Trees and Shrubs
Tetradymia argyraea
Media resource of Tetradymia argyraea
Map not
Available
Tetradymia axillaris
Media resource of Tetradymia axillaris
Map not
Available
Tetradymia canescens
Media resource of Tetradymia canescens
Map not
Available
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This project was made possible in part by the Institute of Museum and Library Services [MG-70-19-0057-19].

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