About Diuris porrifolia Lindl.
Diuris porrifolia Lindl., commonly called the small-flowered donkey orchid, is a tuberous perennial herb. It grows two to three leaves that are 100–200 mm (4–8 in) long and 8–13 mm (0.3–0.5 in) wide. Up to seven yellow flowers with brown or reddish markings are borne on a flowering stem 150–350 mm (6–10 in) high; each flower is 18–25 mm (0.7–1 in) in both length and width. The dorsal sepal is erect, measuring 7–10 mm (0.3–0.4 in) long and 8–10 mm (0.3–0.4 in) wide. Lateral sepals point downwards, and are 15–19 mm (0.6–0.7 in) long and about 3 mm (0.1 in) wide. The petals are roughly erect, 10–13 mm (0.4–0.5 in) long and 5–7 mm (0.2–0.3 in) wide, attached to a stalk 4–6 mm (0.16–0.24 in) long. The middle lobe of the labellum is wedge-shaped with a central fold, 5–6 mm (0.20–0.24 in) long and 4.5 mm (0.2 in) wide; the side lobes are 6–8 mm (0.2–0.3 in) long and 3–4 mm (0.1–0.2 in) wide. Flowering takes place from late July to September. This species is similar to Diuris corymbosa, but has smaller flowers and a more easterly distribution. It has also been confused with D. brachyscapa, the western wheatbelt donkey orchid first described in 2016, which has larger flowers and a more westerly distribution. The small-flowered donkey orchid is found between Perth and Boyup Brook in the south-west of Western Australia, where it grows in woodland and forest.
