Flourensia cernua |
Flourensia pringlei |
|
---|---|---|
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)) |
Distribution |
AZ; NM; TX; Mexico
|
NM; Mexico (Chihuahua, Durango) |
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.) |
|
Source | FNA vol. 21, p. 118. | FNA vol. 21, p. 118. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Ecliptinae > Flourensia | Asteraceae > tribe Heliantheae > subtribe Ecliptinae > Flourensia |
Sibling taxa | ||
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) |
Web links |