Purslane — Portulaca oleracea (Common Purslane, also known as Verdolaga, Pigweed, Little Hogweed or Pusley), is an annual succulent in the family Portulacaceae, which can reach 40 cm in height. It is a native of India and the Middle East, but is naturalised elsewhere and in some regions is considered an invasive weed, but there is evidence that the species …

Ragweed — Ragweeds (Ambrosia), also called bitterweeds and bloodweeds, are a genus of flowering plants from the sunflower family (Asteraceae). The scientific name of this genus is sometimes claimed to be derived from the Ancient Greek term for the perfumed nourishment of the gods, ambrosia which would be ironic since the genus is best known for one fact: its pollen …

Rhododendron — Rhododendron (from the Greek: rhodos, “rose”, and dendron, “tree”) is a genus of flowering plants in the family Ericaceae. It is a large genus with over 1000 species and most have showy flower displays. It includes the plants known to gardeners as azaleas. The Rhododendron is an interesting genus characterized by shrubs and small to (rarely) large trees, …

Rose, French — Rosa gallica, (Gallic Rose, French Rose, or Rose of Provence) is a species of rose native to southern and central Europe eastwards to Turkey and the Caucasus. It is a deciduous shrub forming large patches of shrubbery, the stems with prickles and glandular bristles. The leaves are pinnate, with three to seven bluish-green leaflets. The flowers are …

Rose, Hybrid Rugosa — Rosa rugosa (Rugosa Rose, Japanese Rose, or Ramanas Rose) is a species of rose native to eastern Asia, in northeastern China, Japan, Korea and southeastern Siberia, where it grows on the coast, often on sand dunes. The Japanese name is, meaning “shore pear”. It is a suckering shrub which develops new plants from the roots and …

Tumbleweed — Tumbleweed (also known as Salsola, Saltwort or Russian thistle) is a genus of herbs, subshrubs, shrubs and small trees in the family Amaranthaceae, native to Africa, Asia, and Europe; they typically grow on flat, often dry and/or somewhat saline soils, with some species in saltmarshes. Recent genetic studies have however shown that the genus as traditionally circumscribed is …

Tulip — Tulip (Tulipa) is a genus of about 100 species of flowering plants in the family Liliaceae. Its region includes southern Europe, north Africa, and Asia from Anatolia and Iran in the east to northeast of China. The centre of diversity of the genus is in the Pamir and Hindu Kush mountains and the steppes of Kazakhstan. They are …

Tuberose — The tuberose (Polianthes tuberosa) is a perennial plant of the agave family Agavaceae, extracts of which are used as a top note in perfumery. The common name derives from the Latin tuberosa, meaning swollen or tuberous in reference to its root system. It consists of about 12 species. The tuberose is a night-blooming plant thought to be native …

Toadflax — Linaria is a genus of about 100 species of herbaceous annuals and perennials that was traditionally placed in the foxglove family Scrophulariaceae. Due to new genetic research, it has now been placed in the vastly expanded family Plantaginaceae. The genus is native to temperate regions of Europe, northern Africa and Asia, with the highest species diversity in the …

Teasel — Dipsacus is a genus of flowering plant in the family Dipsacaceae. The members of this genus are known as teasel or teazel or teazle. The genus includes about 15 species of tall herbaceous biennial plants (rarely short-lived perennial plants) growing to 1-2.5 m tall, native to Europe, Asia and northern Africa. The genus name is derived from the …