About Thingia ambigua (S.Watson) Hershk.
Thingia ambigua (S.Watson) Hershk. is an annual plant with fleshy roots. Its stems grow both outwards and upright, reaching lengths of 3–18 centimetres (1.2–7.1 in). The species has narrow leaves that clasp the stem at their base; each leaf blade measures 1.5–6 centimetres (0.6–2.4 in) long. It produces dense clusters of flowers, where each individual flower holds 3–5 white petals. Flowers have 5–10 stamens with yellow anthers, three stigmas, and a pedicel 0.1–0.3 centimetres (0.04–0.12 in) long. The seeds of T. ambigua are oval-shaped and black. This species flowers between November and February. The genus Thingia has several distinctive characteristics that separate it from its close relatives. It has three carpels, while species in the related genera Calyptridium and Philippiamra have only two carpels. Though related genus Lenzia also has three carpels, its foliage differs from that of Thingia. Thingia plants have leafy stems and complex flower structures, while Lenzia plants have almost no visible stems and only produce solitary flowers. An additional difference is found in leaf vein arrangement: Thingia has a three-dimensional vein arrangement, while the veins of the other related genera are arranged in a two-dimensional pattern.
