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
Dombeya tiliacea (Endl.) Planch.
Shrub or small tree, 3.10 x 2.7 m, trunk branched, bark dark gray, rough. Leaves alternate, 4.9 x 3-7 cm, three-lobed basis cordata, margine teeth face bottom covered with fine hairs, stalks pelos, 1-3 cm. Flowers campanulata, 3-4 cm diameter, axillary or terminal, solitary or grouped in a raceme, petals white, obovata.
Polygala chamaebuxus - perennial, evergreen, subfrutescenta, native to Central, Eastern and South-East, it grows on rocky places in alpine floor.
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.
Acacia sieberiana - tree, 3-25 m tall, rounded crown. Increase in savannah, in semi-arid regions of Africa, from 0-1850 m altitude.
Evergreen ornamental plant of the Theaceae family, native from Eastern Asia, its origin is still controversial, being considered by some as species indigenous from Japonia and, by others, from China. It was introduced into Europe by the Portuguese in 1542 and soon spread to Spain, England, France and Italy; into United States at the beginning of the 18th century, and in Australia during the mid 19th century.
Drypetes natalensis (Harv.) Hutch
Small tree, 10 m high, branches edges. Leaves alternate, language narrow oblong or elliptic, round base, asymmetrical, margins deeply soirees, shiny dark green on the upper face, and green inside. Stipele linear, 0.1 cm. Flowers in bundles, appear in the armpit leaves and on old wood, male flowers are nested sepa 4.5, 0 petals
Carpinus betulus - hard wood shaft with durable but less humid conditions. Suprta trimming and better suited for bonsai training.
Deciduous tree, native (Romania), 15 m high. The stem is often crooked, irregular. Crown rare, bright, large and irregular. Bark is thick, deeply wrinkled, forming a cracked ritidom in rectangular plates, dark brown.
Ilex perado - small tree, port pyramidal, evergreen. Originally from the Canary Islands, dense forests grow in the Aqua Garcia, in association with Apollonias barbujana, Arbutus canariensis, Laurus Azores, Myrsine canariensis, Ocotal foetens, Persea indica, Prunus Lusitania subsp. hixa, Visna mocanera.