Flourensia cernua
Flourensia
American tarwort, tarbush
tarwort
erect, branched from bases or ± throughout.
blades elliptic to ovate, 10–25(–40+) × 4–15(–20) mm (margins sometimes undulate).
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.
campanulate to hemispheric, 4–20 mm diam.
flat to conic-ovoid, paleate (paleae conduplicate, cartilaginous to scarious).
0.
0 or [5–]13–21, either neuter, or styliferous and sterile;
corollas yellow.
10–25(–40);
corollas 3–4 mm.
10–50[–150], bisexual, fertile;
corollas yellow, tubes much shorter than cylindric-funnelform throats, lobes 5, ± deltate.
persistent, 12–40 in 2–4+ series (subequal or unequal, outer longer).
discoid or radiate, borne ± singly or in ± spiciform arrays.
4–6.5 mm;
pappi 2.5–3.5 mm.
± compressed or flattened [subterete], oblong to oblanceolate (not winged, ± sericeous);
pappi persistent or tardily falling, of 2 subulate scales.
= 9.
= 36.
Flourensia cernua
Flourensia
Plants of Flourensia cernua usually have a tarry odor and are often locally co-dominant with Larrea tridentata throughout much of the Chihuahuan Desert.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Species ca. 30 (2 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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 |
WildflowerSearch
iNaturalist
USDA Plants Database
