Key to the species of Brassica sect. Brassica 1 Leaves glabrous or subglabrous.................................................................................................................................... 2 - Leaves more or less densely hairy............................................................................................................................. 15 2 Petals white or whitish (rarely pink)............................................................................................................................. 3 - Petals yellow to white-yellowish................................................................................................................................. 6 3 Leaves glaucous; petals white to pink; anthers 5-6 mm; fruit corpus cylindrical, smooth-reticulate 68(−10) mm wide .................................................................................................................................................................... B. hilarionis - Leaves green; petals always white, anthers 2.5−4.5 mm; fruit corpus linear-cylindrical, torulose 3−6 mm wide...... 4 4 Leaf petiole naked; petals 14−20 mm long; seed 2.5−3.5 mm in diameter ................................................. B. insularis - Leaf petiole winged or auriculate; petals 20−28 mm long; seed 1.5−2.4 mm in diameter.......................................... 5 5 Stem 80−150 cm high; leaf petiole winged; petals 8−10 mm wide; stamens exerted 1−3 mm from corolla disc; rostrum 5−14 mm long, 0−1 seeded .............................................................................................. B. cretica subsp. cretica - Stem 30−80 cm high; leaf petiole not winged; petals 10−14 mm wide; stamens exerted 5−8 mm from corolla disc; rostrum 15−25 mm long, 1−3 seeded. ......................................................................................................... B. atlantica 6 Leaves with side veins anastomosing; petals yellow-whitish or light yellow............................................................... 7 - Leaves with side veins reaching the margin teeth; Petals deep yellow...................................................................... 11 7 Leaves glaucous-greyish............................................................................................................................................... 8 - Leaves green................................................................................................................................................................. 9 8 Leaves 15−20 cm long, undivided, with petiole 1−5 cm long; fruit torulose, with 11−14 seeds .............. B. bourgeaui - Leaves 20−45 cm long, lobate, with petiole 5−20 cm long; fruit smooth, with 15−40 seeds........................................ ............................................................................................................................................ B. oleracea subsp. oleracea 9 Leaf petiole without wings or auricles; fruit with inconspicuous midrib .................................................... B. montana - Leaf petiole partially winged or auriculate; fruit with marked midrib....................................................................... 10 10 At least the first leaves long-petiolate, never auriculate; leaf lamina with minutely crenate-serrate margin; petals whitish-yellow ........................................................................................................................ B. cretica subsp. laconica - All leaves short petiolate to sessile, often auriculate; leaf lamina with entire to inconspicuous dentate margin; petals light yellow .............................................................................................................................. B. cretica subsp. aegaea 11 Fruit cylindrical navicular, 8−12 mm wide, with valves thickened-spongy, without midrib and rostrum widely conic, 10−20 mm, 1−2-seeded ................................................................................................................. B. macrocarpa - Fruit linear-cylindrical, 3−7 mm wide, with valves thin, dorsally ribbed, and rostrum subulate to narrowly conic, 4− 12 mm, seedless.......................................................................................................................................................... 12 12 Stem usually 35−45 cm high; leaf without basal lobes; fruit corpus up to 9 cm long ................................. B. tyrrhena - Stem(60−) 80150 cm high; leaf with 1-3 basal lobes, fruit corpus max. 7 cm long.................................................. 13 13 Petals pale yellow, 14−20 × 5−8 mm; fruit 35−45 × 6−7.5 mm ....................................... B. villosa subsp. brevisiliqua - Petal yellow, 18−27 × 713 mm; fruit 35−70 × 3−4.5 mm......................................................................................... 14 14 Leaves green, glabrous; leaf lamina ovate-lanceolate, acute at apex, deeply incised, loosely dentate at margin; fruit valves lightly ribbed ........................................................................................................... B. rupestris subsp. rupestris - Leaves glaucescent, covered by hispid hairs; leaf lamina ovate-elliptical, obtuse at apex, lobate, minutely dentate at margin; fruit valves prominently ribbed .............................................................................. B. rupestris subsp. hispida 15 Ovary hairy; fruit corpus hairy, subglobose to ellipsoid, smooth, thickened, spongy, 8−18 × 8−11 mm...................... ................................................................................................................................................................. B. trichocarpa - Ovary glabrous; fruit corpus glabrous, linear-cylindrical, torulose, thin, 25−100 × 36.5 mm................................... 16 16 Leaf petiole not auriculate on foot.............................................................................................................................. 17 - Leaf petiole auriculate on foot.................................................................................................................................... 20 17 Leaf lyrate, crispate denticulate at margin, with petiole evidently winged; fruit 5−6.5 mm wide ......... B. drepanensis - Leaf lobed, irregularly dentate at margin, with petiole not winged; fruit 3−4.5 mm wide........................................ 18 18 Leaf minutely dentate; fruit corpus laterally flattened, 25−30 mm long ...................................... B. villosa subsp. tinei - Leaf broadly dentate; fruit corpus never laterally flattened, 30−75 mm long........................................................... 19 19 Leaf margin crenate-dentate; sepals 12−15 mm long; petal 24−26 mm long; fruit 4−4.5 mm wide, dorsally ribbed... .................................................................................................................................................. B. villosa subsp. villosa - Leaf margin irregularly dentate; sepals 8−11 mm long; petal 16−22 mm long; fruit 3.5−3.8 mm wide, dorsally not ribbed .................................................................................................................................. B. villosa subsp. bivoniana 20 Fruiting pedicels 15−25 mm long; petal light yellow............................................................... B. incana subsp. cazzae - Fruiting pedicels 25−35 mm long; petal deep yellow................................................................................................ 21 21 Leaves green-greyish, rounded; fruit 6−10 cm long, usually without midrib; rostrum widely conic........................... ................................................................................................................................................... B.incana subsp. incana - Leaves glaucous, obtuse; fruit 3.5−6 cm long, with midrib; subulate or subulate conic............................................ 22 22 Fruit tetragonal, (3.5−) 4−6 cm long, 3−4 mm wide; rostrum 5−8 mm long, subulate ............ B. botterii subsp. mollis - Fruitflattened, 3−4 cm long, 4−5 mm wide; rostrum (5−) 8−15 mm long, subulate-conic........................................... ................................................................................................................................................ B. botterii subsp. botterii

Published as part of Brullo, Cristian, Brullo, Salvatore, Galdo, Gianpietro Giusso Del & Ilardi, Vincenzo, 2013, Brassica trichocarpa (Brassicaceae), a new species from Sicily, pp. 45-60 in Phytotaxa 122 (1) on pages 56-57, DOI: 10.11646/phytotaxa.122.1.2, http://zenodo.org/record/5079490