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Calycoseris
Family:
Asteraceae
Patrick Alexander
Flora of North America
Resources
L. D. Gottlieb in Flora of North America (vol. 19, 20 and 21)
Annuals
, 5-30 cm; taprooted.
Stems
1-3, erect or ascending, branched from bases; distal stems, branches, and involucres conspicuously dotted with short, stipitate, flat-topped glands that resemble tacks.
Leaves
basal and cauline; alternate; sessile; basal blades pinnately lobed (lobes narrow, linear, often delicate, spreading, margins entire, smooth); distal reduced to linear, entire bracts.
Heads
borne singly or in open, cymiform arrays.
Peduncles
(1-3 cm) not inflated, not bracteate.
Calyculi
of 8-16, reflexed, unequal bractlets (lengths to
1
/2 phyllaries).
Involucres
campanulate, 5-12+ mm diam.
Phyllaries
12-20 in 1 series, linear-lanceolate, equal, margins scarious, apices acute
. Receptacles
flat, smooth, bristly, epaleate (each floret subtended by 1 fine, capillary bristle).
Florets
ca. 25; corollas white or yellow (showy).
Cypselae
tan to brown, fusiform, beaked, ribs 5, separated by longitudinal grooves, faces glabrous or scabridulous;
pappi
(borne on denticulate cups at beak tips) falling (together), of 50-60+, white, basally connate, smooth bristles 5-8(-9) mm in 1 series.
x
= 7.
Species within checklist:
Phoenix Four Rivers Flora
Calycoseris wrightii