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Tracyina
Family:
Asteraceae
Images
not available
FNA
Resources
John L. Strother in Flora of North America (vol. 20)
Annuals,
5-30+ cm (taprooted).
Stems
erect, simple or branched distally, glabrous or sparsely hirsutulous.
Leaves
mostly cauline (at flowering); alternate; ± sessile; blades (1- or 3-nerved), lance-linear to linear, margins entire (ciliate), faces glabrous or sparsely hirsutulous.
Heads
radiate, borne singly (tips of branches).
Involucres
± cylindric to turbinate or obconic, 1-3+ mm diam.
Phyllaries
(persistent) (6-)20-30+ in (2-)3-4+ series, appressed, 1-nerved (flat),linear to subulate, unequal (outer shorter), herbaceous, abaxial faces glabrous or sparsely hirsutulous.
Receptacles
convex, pitted or smooth, epaleate.
Ray florets
(3-)12-15(-20+), pistillate, fertile; corollas yellowish, often tinged with purple (laminae inconspicuous).
Disc florets
(4-)15-25+, bisexual, fertile; corollas pale yellow to purplish, tubes shorter than narrowly cylindric throats, lobes 5, erect, lance-deltate; style-branch appendages attenuate.
Cypselae
± fusiform (distally attenuate, almost beaked), 5-nerved, glabrous or glabrate (ray) or ± hirsutulous (disc);
pappi
persistent (fragile), of (12-)30-40 whitish, barbellulate, apically attenuate bristles in 1(-2) series (subequal or outer shorter).
x
= 9.
Tracyina rostrata
Images
not available
Map not
Available