Scientific Name – Flourensia cernua DC.
Common name(s) – tarbush, blackbrush, varnishbush, hojasé, Yerba del Hule.
Distribution and Habitat – common (endemic) on dry plains to the Chihuahuan Desert, Arizona, California, New Mexico and Texas at elevation ranging from 400-2000 m. Is associated with Hilaria mutica, Larrea tridentate, Prosopis sp., Scleropogon brevifolius. It is found in limestone or calcareous, deeper soils.
Description – deciduous shrub, erect to procumbent, 30 -200 cm tall, much branched. Twig light brown, gray, slender, resinous, pubescent; trunk gray to dark gray, glabrous, sparingly striate, resinous. Leaves alternate, simple, elliptical or oblong to oval, 1.6-2.5 x 0.6-1.2 cm, acute, margins entire, adaxially green and glabrous, abaxially paller and glabrous or pubescent, veins often black; petioles 1-2.5 mm long, puberulent. Inflorescences small, solitary. Flowers with 3 series bracts; bracts linear; ray flowers absent; disk flower 12-20, yellow, resinous. Flowering in July to December. Fruit achene, 0.5-1 cm long, oblong, compressed, villous; papus of 2-4 unequal bristles, 2.5-3.3 mm long.
Growth rate – slow
Requirements – prefers heavy, deep soils; full sun, light water.
Propagation – by seeds.
Properties and Uses – mature fruit is poisonous to sheep and goats. In Mexic, an infusion of the leaves is drunk frequently to treat various gastrointestinal ailments.
Curiosity – the genus Flourensia, tribe Heliantheae, consist of 32 species of resinous shrubs that grow from southern United States south to Argentina and Chile.
A.Powell – Trees and Shrubs of the Trans-Pecos and adjacent areas- University of Texas Press, 1998
James Stubbendieck, Stephan L. Hatch, L.M. Landholt – North American Wildland Plants – University of Nebraska Press, 2003
Mahendra Rai, Maria Cecilia Carpinella – Naturally Occuring Bioactive Compounds- Elsevier Science, 2006
Trees and shrubs
Theobroma cacao - the tree deciduu originating from semi-tropical forests of Brazil, Mexico and the U.S.A
The genus name derives from the Greek "theos" = god, and 'bromine' = food, food of the gods.
Rosmarinus officinalis L.
Evergreen shrub, 50 - 300 cm, stem erect, latita to the very ramified, in the lower trunk bark is exfoliating in longitudinal strips, dark brown. The leaves are coriacee, persistent, Sesia, linear
Alnus incana (L.) Moench - white alder
Mano tree or shrub that can reach 20 m, with stem often crooked, crown with branches thick, upward, lush foliage, lujerii in young gray, pubescent. Bark smooth, shiny, whitish gray, the old copies, to the base with shallow cracks. Wide elliptical leaves up to ovata, by 4.10 cm long, 4-6 cm wide, rounded to the double needle and lobe, pointed, gray green face, white inside gray, furry, ready alternative.
Prunus serotina - a native of North America, grows on the edge of forests on sandy soils and poor.
Stachys officinalis - a species native to Europe and the Caucasus, grass grows on soils, pastures arid and mountainous deciduous paduride collinear, from 0 to 1800 m altitude.
Anemoides trifolia - geofita rizomatoasa, native to southern Europe, grows in forests and mountain collinear, hornbeam and beech.
Helianthemum nummularium - Rock Rose
Scientific name, Helianthemum numularium, derived from the Greek Helios = sun and the Latin word indicating the currency, numumus = currency, because the flowers that sparkle in sunlight like a golden coin.
Tree 25 m high. Trunk erect, branched. Ritidom smooth, dark gray. Crown broad, thick, tapered. Leaves persistent, alternate, coriacee, lamina ovat-oblong, acute, entire and slightly wavy edge on the upper side and glossy green color, on the underside is brown-rust, pubescent, ribbed central rib obvious; nervatiuni pinnate secondary.