Gymnodiscus

Gymnodiscus is a genus of two species of annual flowering plants in the sunflower family. Both have yellow flowerheads with both ray and disc florets and very short pappus, with only the ray florets setting seed. The leaves are in a basal rosette. The genus is called geelkruid in Afrikaans and hair daisy in English. The continued survival of both species is considered to be of least concern.

== Description == The species of geelkruid are annual herbs of usually up to tall, with a leaf rosette at their base, with peduncles that branch from base, with cobweb hairs in its heart and with a slender taproot. All leaves are set in a circle at the plants foot, laying flat on the ground or spreading to more or less upright but recurving. The leaves are either succulent and spindle-shaped, or leathery and inverted egg- to spathula-shaped to inverted lance-shaped or with a large terminal lobe and smaller rounded lobes toward its base. The leaves are often mottled purple or purple on the underside. The midvein extends at the tip in a sharp point. There are one to several peduncles rising from the leaf rosette that branche higher up, carrying few bracts. Sometimes there are also peduncles emerging sideways from the axils of the leaf-like bracts, the bracts higher up are small and line- to heart-shaped. The flowerheads (or capitula) have both central disk florets and ray florets along the rim. The flowerheads appear in small clusters approximately in a curved plain, and several of these cluster jointly form a aggregated panicle-like inflorescences. The involucre of green bracts surrounding the yellow florets in each flowerhead is bell- to almost globe-shaped. It consists of one row of five to eight, rarely nine free bracts. These are lance-shaped to elliptic, hairless, chaff-like along the margins and have darker tips. The base of the flowerhead on which the individual florets are implanted is cone-shaped, pitted where the florets sit, hairless and without scales. The five to nine ray florets are functionally bisexual and yellow in colour, and elliptic to oval above the split of the tube at the base. The ovary is elliptic to inverted egg-shaped, hairless or with very short, fine and scarcely visible downy twin-hairs. The style is cylindrical above the slightly thickened base and splits near the top in two branches with two distinct lateral stigmas, the tips narrowly egg-shaped and shortly grainy in structure. The dark brown, one-seeded fruits are elliptic to inverted egg-shaped, long, with 5 ribs, and hairless or with the adpressed puberulous twin-hairs as in the ovay. The pappus consists of white, short barbed bristles that are united at their base and are about a quarter of the length of the fruit and are not shedded. The few to many, yellow, disc florets are functionally male, with a funnel-shaped perianth tube that splits into five spreading lobes. The anthers blunt at their base and have oval appendages at their tips. The five filaments with swollen bases and a narrow neck form a collar.The ovary is narrowly ellipsoid and hairless and is topped by a simple style with a cone-shaped tip and without pappus.