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
Jasminum nudiflorum Lindl.
Decidua species native to China. Green stems, 60-90 cm high, 1-2 m diameter, edges, form adventitious roots. Brownish-red buds, ovoizi. Decidue leaves, opposite, pinnate-compound, 3 leaflets oblong, Sesi. Flowers solitary, six petals, 1-2 cm in diameter. Flowering period from January to March, before leaf. Baca fruit, fleshy, ripening black.
Wisteria sinensis - Chinese wisteria
Wisteria sinensis - is considered invasive in some places around the globe. In most cases become established in places where it is cultivated ornamental.
Where there is danger of becoming glycineinvasive is better to be replaced with Aristolochia macrophylla, Bignonoa capreolata, Campsis radicand, Lonicera sempervirens, Wisteria frutescens.
Schinus molle - evergreen tree, 3-15 m tall. Originally from Argentina, Bolivia and Peru where it grows from 0 to 2400 m altitude. Cultivated soil erosion, but also as ornamental species, or bonsai.
Evergreen tree, 10-40 m height, 3 m. Branches culture clocks or easy erection. Bark smooth, gray-white to silver. Leaves alternate, dark green, 7-20 cm long, slightly pubescent, oblong-elliptic, prominent central rib, full and wavy edges, top acute, base acute.
Symphoricarpos - Hurmuz
Shrubs decide, prostate or erect, 90-120 cm, originating in the U.S.. Buds scaly, 1.5 mm long. Leaves simple, opposite, short petiolate, 7 cm long. Raceme blossom. Campanulata Flowers in raceme children. Calyx tube slightly globos; Corola campanulata, 4-5 lobes. Fruit drupe, 1-1.5 cm in diameter, S. albus and S. occidentalis fruits white, pink-coral S. orbiculatus fruit. A fruit contains two seeds oblongata.
Acanthus mollis - Bear's Breeches
Native of the Mediterranean area, grows in gardens like ornamentals. Flower can be over 1.8 m tall, the purple-pink bracts contrasting with the white flowers. Prefer shelter and deep, moist soil.
Verbascum blattaria - Herbaceous biennial, glabra bottom of the stem and glandular hairs towards the top, grows spontaneously in the desert and the hot side of cultivated fields, rivers and channels, up to 800 m altitude.
Acer tataricum - tatarian maple
Acer tataricum - interest forest and ornamental tree grown in parks and gardens.It is used in dyeing natural fibers.
Corylus avellana - hazelnut
Corylus avellana - shrub, common in Europe and western Asia, from plains to 1,200 m altitude, increase in association with Acer pseudoplatanus, Crataegus laevigata, Crataegus monogyna, Fraxinus excelsior, Lonicera xylosteum, Salix caprea, Sambucus nigra and Sorbus aria.