Polemonium, commonly called Jacob's ladders or Jacob's-ladders, is a genus of between 25 and 40 species of flowering plants in the family Polemoniaceae, native to cool temperate to arctic regions of the Northern Hemisphere. One species, Polemonium micranthum, also occurs in the southern Andes in South America. Many of the species grow at high altitudes, in mountainous areas. Most of the uncertainty in the number of species relates to those in Eurasia, many of which have been synonymized with Polemonium caeruleum.
Asperula, commonly known as woodruff, is a genus of flowering plants in the family Rubiaceae. It contains 194 species and has a wide distribution area from Europe, northern Africa, temperate and subtropical Asia to Australasia.
Cynanchica, commonly known as woodruff, is a genus of flowering plants in the family Rubiaceae. It contains 73 species and has a wide distribution area from Europe, northern Africa, the Middle East and central Asia. The genus was erected in 2020 to accommodate species split from the genus Asperula.
Cynanchica aristata, commonly known as woodruff, is a deciduous species of perennial groundcover, and a flowering plant in the family Rubiaceae. It is native to Morocco, Libya, Algeria, Tunisia, Azerbaijan, Georgia, Armenia, Greece, Bulgaria, Albania, Serbia, North Macedonia, Croatia, Italy, Austria, Switzerland, France, Spain, and Portugal.
Asperula crassula is a species of flowering plant in the family Rubiaceae, endemic to a few hundred hectares in northeast Crete. It was first described in 1857.
Cynanchica gussonei, also known as alpine woodruff, is a deciduous species of perennial groundcover, and a flowering plant in the family Rubiaceae. It was first described in 1831 and is endemic to Sicily.
Asperula involucrata is a species of flowering plant in the family Rubiaceae.
Cynanchica lilaciflora is a species of flowering plant in the family Rubiaceae.
Cynanchica mungieri is a species of flowering plant in the family Rubiaceae.
Asperula podlechii is a species of flowering plant in the family Rubiaceae. It was first described in 2005 and is endemic to Afghanistan.
Asperula taygetea is a species of flowering plant in the family Rubiaceae. Asperula taygetea was first described in 1849 and is endemic to Greece.
Cynanchica abbreviata, commonly known as woodruff, is a species of flowering plant in the family Rubiaceae that is endemic to Naxos and Amorgos in Greece. It was first formally described in 1901 by Eugen von Halácsy who gave it the name Asperula lutea var. abbreviata in Conspectus Florae Graecae. In 1943, Karl Heinz Rechinger raised the variety to species status as Asperula abbreviata in Denkschriften der Kaiserlichen Akademie der Wissenschaften / Mathematisch-Naturwissenschaftliche Classe. In 2020, it was reclassified into the newly erected genus Cynanchica.
Cynanchica abchasica, commonly known as woodruff, is a deciduous species of perennial groundcover, and a flowering plant in the family Rubiaceae. It is endemic to Transcaucasus, and was first named by V.I Krecz. In 2020, it was reclassified into the newly erected genus Cynanchica.
Asperula acuminata is a deciduous species of perennial groundcover, and a flowering plant in the family Rubiaceae, known as Woodruff, and is endemic to NE. New South Wales of Australia, and was first named by I.Thomps.
Cynanchica affinis is a deciduous species of perennial groundcover, and a flowering plant in the family Rubiaceae. It is endemic to north-eastern Turkey and the Transcaucasus, and was first named by Boiss. & A.Huet.
Asperula albiflora is a deciduous species of perennial groundcover, and a flowering plant in the family Rubiaceae, known as Woodruff, and is endemic to Turkmenistan, and was first named by Popov.
Asperula ambleia is a deciduous species of perennial groundcover, and a flowering plant in the family Rubiaceae, known as Stiff Woodruff, and is endemic from SE. Queensland to NE. Victoria in Australia, and was first named by Airy Shaw.
Asperula apuana is a deciduous species of perennial groundcover, and a flowering plant in the family Rubiaceae, known as Woodruff, and is endemic to Italy, and was first named by (Fiori) Arrigoni.
Asperula assamica is a deciduous species of perennial groundcover, and a flowering plant in the family Rubiaceae, known as Woodruff, and is endemic to Assam, East Himalayas, and was first named by Meisn.
Asperula asterocephala is a deciduous species of perennial groundcover, and a flowering plant in the family Rubiaceae, known as Woodruff, and is endemic to Iraq, and was first named by Bornm.
