Hymenonema
From Wikipedia, the free encyclopedia
| Hymenonema | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Subfamily: | Cichorioideae |
| Tribe: | Cichorieae |
| Subtribe: | Scolyminae |
| Genus: | Hymenonema Cass. |
| Type species | |
| Catananche graeca | |
| Species | |
Hymenonema is a genus of flowering plants in the family Asteraceae endemic to Greece. On each of the single or few stems, the species have one to three flowerheads consisting of yellow or yolk yellow ligulate florets, scaly pappus, greyish, pinnately segmented leaves in a basal rosette, and few smaller leaves on the 20–70 cm high stems. It contains two species: Hymenonema graecum, that is known from the Cyclades, and Hymenonema laconicum, which occurs in the central and south-eastern Peloponnesos.[1]
Both Hymenonema species are herbaceous perennial plants, with short glandular hairs, and a basal rosettes of pinnately segmented leaves that appears greyish due to longer hairs without glands that are pressed to the leaf surfaces. Plants may have one or few solid stems with zero to two branches, carrying few smaller leaves, the lowest pinnately segmented, and the higher increasingly simple, small and narrow. Each branch carries one flowerhead at its tip. The flowerhead consist of several overlapping rows of involucral bracts, with papery margins. The common base of the florets (or receptacle) is pitted, and carries scales near its margin. The ligulate florets are yellow and have five triangular teeth at their tip. The fruits (or cypselas) are five-angled and carry few or many rigid, appressed hairs. The cypselas are topped by the changed calyx called pappus, which consists of rigid hairs and scales in 2-3 rows, or sometimes only of scales.[2]