Flora of North America species comparison

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Flourensia

tarwort
Habit Subshrubs or shrubs [trees], to 100(–200)[–500+] cm.
Stems

erect, branched from bases or ± throughout.
Leaves

cauline; alternate;

petiolate [nearly sessile];

blades pinnately nerved, mostly elliptic to lance-oblong or ovate, bases rounded to cuneate, margins entire [toothed], faces glabrous or ± scabrellous, usually gland-dotted and vernicose.
Involucres

campanulate to hemispheric, 4–20 mm diam.
Receptacles

flat to conic-ovoid, paleate (paleae conduplicate, cartilaginous to scarious).
Ray florets

0 or [5–]13–21, either neuter, or styliferous and sterile;

corollas yellow.
Disc florets

10–50[–150], bisexual, fertile;

corollas yellow, tubes much shorter than cylindric-funnelform throats, lobes 5, ± deltate.
Phyllaries

persistent, 12–40 in 2–4+ series (subequal or unequal, outer longer).
Heads

discoid or radiate, borne ± singly or in ± spiciform arrays.
Cypselae

± compressed or flattened [subterete], oblong to oblanceolate (not winged, ± sericeous);

pappi persistent or tardily falling, of 2 subulate scales.
x

= 9.

Flourensia
Distribution
from USDA
sw United States; Mexico; Central America; South America
[BONAP county map]
Discussion

Species ca. 30 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Shrubs; leaf blades elliptic to ovate, 10–25(–40+) × 4–15(–20) mm; ray florets 0
F. cernua
1. Subshrubs; leaf blades elliptic to lance-oblong, (20–)50–100 × 10–40+ mm; ray florets 13–21
F. pringlei
Source FNA vol. 21, p. 117. Author: John L. Strother.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Ecliptinae
Subordinate taxa
F. cernua, F. pringlei
Name authority de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 592. (1836)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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