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American tarwort, tarbush

Pringle's tarwort

Habit Shrubs to 100(–200) cm. Subshrubs to 100 cm.
Leaf

blades elliptic to ovate, 10–25(–40+) × 4–15(–20) mm (margins sometimes undulate).

blades elliptic to lance-oblong, (20–)50–100 × 10–40+ mm.

Ray florets

0.

13–21;

laminae 10–15+ mm.

Disc florets

10–25(–40);

corollas 3–4 mm.

40–50;

corollas 5–6 mm.

Cypselae

4–6.5 mm;

pappi 2.5–3.5 mm.

8–12 mm, sericeous;

pappi to 4 mm.

2n

= 36.

Flourensia cernua

Flourensia pringlei

Phenology Flowering mostly Sep–Nov. Flowering mostly Aug–Oct.
Habitat Limestone or alkaline or clay soils, gravelly sites, desert scrub Rocky slopes, disturbed sites
Elevation 800–2000+ m [2600–6600+ ft] 1500–2100 m (Mexico) [4900–6900 ft (Mexico)]
Discussion

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.)

Distribution
from FNA
AZ; NM; TX; Mexico
[WildflowerSearch map]
[BONAP county map]
from FNA
NM; Mexico (Chihuahua, Durango)
[BONAP county map]
Parent taxa Asteraceae > tribe Heliantheae > subtribe Ecliptinae > Flourensia Asteraceae > tribe Heliantheae > subtribe Ecliptinae > Flourensia
Sibling taxa
F. pringlei
F. cernua
Synonyms Helianthella pringlei
Name authority de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 593. (1836) (A. Gray) S. F. Blake: Proc. Amer. Acad. Arts 49: 375. (1913)
Source Flora of North America vol. 21, p. 118. Flora of North America vol. 21, p. 118.
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