Sidney Alfred Skan

Quercus franchetii, commonly known as the zhui lian li evergreen oak, is a species of oak in the Ilex section of the genus, native to a wide area of eastern Asia. It is an oak native to China (Sichuan and Yunnan), northern Thailand and Vietnam, growing at altitudes between 800 and 2,600 metres (2,600 and 8,500 feet).

Quercus blakei is an uncommon species of tree in the beech family Fagaceae. It has been found in Indochina (Laos and Vietnam) and southern China (Guangdong, Guangxi, Guizhou, Hainan ). It is placed in subgenus Cerris, section Cyclobalanopsis.

Quercus edithiae is a species of tree in the family Fagaceae and the "ring-cupped oak" sub-genus. It has been found in Vietnam, southern China (Guangdong, Guangxi, and Hainan) and Hong Kong. In Vietnam it is called sồi editha. It is placed in subgenus Cerris, section Cyclobalanopsis. Quercus edithiae is a tree up to 20 m. tall with hairless twigs. The leathery leaves are glabrous, oblong-elliptic to obovate, 50-160 × 20–60 mm, with a 20–30 mm petiole. The acorn is ellipsoid to cylindric-ellipsoid, 30-45 × 20–30 mm, with a scar approx. 7 mm in diameter.

Pterocarya hupehensis (commonly known as the Hubei Wingnut) is a tree in the Juglandaceae family native to China. It grows on moist streambanks at 700 to 2,000 m (2,300 to 6,600 ft) elevation—mostly in North Guizhou, West Hubei (Changyang Xian), South Shaanxi, West Sichuan. Genetic and phylogeographic research indicates that populations of P. hupehensis experienced historical divergence and demographic changes associated with the strengthening of the East Asian monsoon and Quaternary climatic fluctuations.

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Salvia tysonii is a rarely encountered species of sage commonly called Tambookie sage. It is found in South Africa′s Eastern Cape and KwaZulu-Natal provinces, growing in grassland, typically on rocky slopes or alongside streams at an elevation of 750–1,450 m (2,460–4,760 ft).

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Tephrosia clementii is a plant species, endemic to the north-west of Western Australia. It is an annual with a prostrate, spreading habit, growing to between 0.1 and 0.25 metres high. Orange or red flowers are produced between January and March in the species' native range. The species was first formally described by S.A.Skan in 1903 in Icones Plantarum, from a collection by Emile Clement between the Ashburton and Yule Rivers.

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Stachys zeyheri, the twiggy woundwort, is a species of hedgenettle endemic to South Africa.

Stachys bolusii, the strandveld woundwort, is a species of hedgenettle endemic to South Africa′s Western Cape province.

Aptosimum molle is a flowering plant species in the genus Aptosimum, which is native to dry tropical and Southern Africa. It belongs to the family Scrophulariaceae. While specific characteristics for A. molle are not widely available, it is related to other species in the genus, which include plants with blue or violet trumpet-shaped flowers and leaves that vary in shape.

Aptosimum gossweileri is a species of flowering plant in the family Scrophulariaceae. It is a robust, glandular-pilose undershrub with long, procumbent, many-branched stems and thick, fleshy leaves that have a persistent midrib, which can form a straight, stout spine. The species is found in dry tropical and Southern Africa and is characterized by its axillary flowers that are typically clustered in pairs, with glandular-pubescent, blue to purple corollas.

Stachys tysonii is a species of hedgenettle found in South Africa and Lesotho.

Stachys sublobata is a species of hedgenettle endemic to South Africa's Western Cape province.

Stachys rudatisii is a species of hedgenettle endemic to South Africa's KwaZulu-Natal province.

Stachys rehmannii, the Limpopo woundwort, is a species of hedgenettle endemic to South Africa's Limpopo province.

Stachys flexuosa, the Amathole woundwort, is a species of hedgenettle endemic to South Africa.

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