Lupinus, Linnaeus, 1753

Contreras-Ortiz, N., Jara-Muñoz, O. A. & Hughes, C. E., 2018, The acaulescent rosette species of Lupinus L. (Fabaceae) of Colombia and Ecuador including a new species from Colombia, Phytotaxa 364 (1), pp. 61-70 : 69

Key to the acaulescent rosette species of Lupinus from Colombia and Ecuador

1a. Plants up to 30 cm tall. Inflorescences held below the leaves or occasionally extending only very slightly above foliage................ ........................................................................................................................................................................................ L. nubigenus

1b. Plants more than 30 cm tall. Inflorescences clearly overtopping the foliage.....................................................................................2

2a. Floral bracts persistent, at least 2–4 times the flower length, covered by very dense silky pubescence, remaining upcurved and concealing the flowers even at full anthesis. Leaflets oblanceolate, with a very dense silky indumentum............. L. alopecuroides

2b. Floral bracts often caducous by the time fruits form, no more than twice the length of the flowers, covered by sparse silky hairs, upcurved when in bud and exserted beyond the flowers, withering before anthesis, the flowers conspicuous (not or almost never concealed by bracts). Leaflets narrowly elliptic or oblanceolate, covered with a scattered to sparse white silky indumentum........3

3a. Longer leaflets 9.3–26.8 cm long, the leaflets narrowly elliptic to very narrowly elliptic. Inflorescence 70–110 cm long at full development.......................................................................................................................................................................................4

3b. Longer leaflets to 5.7–9 cm long, leaflets oblanceolate to narrowly oblanceolate. Inflorescence less than 60 cm long at full development................................................................................................................................................................................................5

4a. Free stipule tips narrow filiform (lanceolate) and flexuose, 20–33 × 1.4–4.4 mm. Inflorescence to 70 cm at full development. Standard petal with a conspicuous white central blotch. Style semi-persistent on mature fruits. Leaflets narrowly elliptic up to 12 cm long ........................................................................................................................................................ L. luisanae var. luisanae

4b. Free stipule tips triangular flexuose, 7–20 × 2–5.1 mm. Inflorescence 100 cm or more at full development. Standard petal with an incipient white central blotch restricted to the tip of the petal. Style persistent on mature fruits. Leaflets very narrowly elliptic up to 26.8 cm long........................................................................................................................................... L. luisanae var. ocetensis

5a. Petioles up to twice the length of the longer leaflets. Leaflets narrowly oblanceolate, covered by a white silky (sericeous) pubescence scattered on the adaxial side and dense on the abaxial side, the secondary venation visible along the entire leaflet length when dry .......................................................................................................................................................................... L. triananus

5b. Petioles at least three times the length of the longer leaflets. Leaflets oblanceolate, apex acuminate, covered on both sides by a dense sericeous whitish to silvery short pubescence, the secondary venation not visible ................................................ L. carrikeri