| 1 |
Leaves whorled. |
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(2) |
| + |
Leaves alternate. |
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(8) |
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| 2 (1) |
Flowers campanulate; stamens converging. |
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(3) |
| + |
Flowers not campanulate, tepals spreading, recurved, or revolute; stamens diverging. |
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(4) |
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| 3 (2) |
Tepals purple, narrowly elliptic or rarely narrowly ovate, 25--35 × 10--14 mm |
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6 Lilium paradoxum |
| + |
Tepals yellow, elliptic, 50--60 × 20--24 mm |
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7 Lilium medogense |
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| 4 (2) |
Flowers erect; tepals spreading or slightly recurved |
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3 Lilium tsingtauense |
| + |
Flowers nodding to horizontal; tepals revolute. |
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(5) |
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| 5 (4) |
Nectaries papillose on both surfaces. |
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(6) |
| + |
Nectaries not papillose. |
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(7) |
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| 6 (5) |
Bulb scales not articulate; tepals purple-red, with deeply colored spots |
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2 Lilium martagon var. pilosiusculum |
| + |
Bulb scales articulate; tepals pale orange-red, with purple-red spots |
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4 Lilium distichum |
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| 7 (5) |
Bulb scales articulate; tepals apricot-colored to scarlet, with black spots, scarcely thickened |
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5 Lilium medeoloides |
| + |
Bulb scales not articulate; tepals yellow or red-orange, with brown spots, thickened |
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1 Lilium hansonii |
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| 8 (1) |
Flowers funnelform or campanulate; stamens distally curved upward or converging. |
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(9) |
| + |
Flowers neither funnelform nor campanulate (slightly funnelform in L. nepalense); tepals revolute or not; stamens diverging apically. |
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(30) |
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| 9 (8) |
Flowers horizontally spreading or nodding, funnelform; tepals white, unspotted; stamens curved upward distally. |
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(10) |
| + |
Flowers campanulate, spotted or unspotted; stamens converging. |
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(18) |
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| 10 (9) |
Nectaries papillose on both surfaces; leaf axils without bulblets. |
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(11) |
| + |
Nectaries not papillose; leaf axils sometimes with bulblets in distal part of stem. |
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(12) |
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| 11 (10) |
Bracts lanceolate, not curved apically; style glabrous |
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45 Lilium brownii |
| + |
Bracts linear-lanceolate, curved apically; style densely pubescent proximally |
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46 Lilium anhuiense |
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| 12 (10) |
Leaf axils in distal part of stem with bulblets. |
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(13) |
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Leaf axils without bulblets. |
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(14) |
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| 13 (12) |
Filaments glabrous; bulblets brown |
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52 Lilium sulphureum |
| + |
Filaments densely pubescent proximally; bulblets green |
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53 Lilium sargentiae |
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| 14 (12) |
Bulb scales articulate |
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47 Lilium wenshanense |
| + |
Bulb scales not articulate. |
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(15) |
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| 15 (14) |
Leaves linear, 2--7 mm wide. |
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(16) |
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Leaves lanceolate or oblong-lanceolate, 6--18 mm wide. |
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(17) |
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| 16 (15) |
Leaves 2--3 mm wide, papillose at margin and on midvein abaxially |
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48 Lilium regale |
| + |
Leaves 4--13 mm wide, smooth at margin and on midvein abaxially |
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49 Lilium formosanum |
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| 17 (15) |
Filaments glabrous |
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50 Lilium longiflorum var. scabrum |
| + |
Filaments pubescent |
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51 Lilium leucanthum |
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| 18 (9) |
Nectaries of inner tepals papillose or with fimbriate projections on both surfaces. |
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(19) |
| + |
Nectaries of inner tepals neither papillose nor with fimbriate projections. |
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(23) |
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| 19 (18) |
Nectaries of inner tepals papillose on both surfaces; flowers erect. |
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(20) |
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Nectaries of inner tepals with fimbriate projections on both surfaces; flowers nodding or horizontal. |
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(21) |
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| 20 (19) |
Leaves not white woolly basally; stem papillose; style slightly shorter than ovary; tepals 2--6 cm |
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11 Lilium concolor |
| + |
Leaves with a cluster of white woolly hairs basally; stem smooth; style more than 2 × as long as ovary; tepals 7--9 cm |
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12 Lilium dauricum |
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| 21 (19) |
Tepals yellow, pale yellow, or greenish yellow, lanceolate or ovate-lanceolate |
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8 Lilium lophophorum |
| + |
Tepals pale purple, purple-red, or yellow, rarely white, often spotted purplish, elliptic or ovate-elliptic. |
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(22) |
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| 22 (21) |
Style 4--6 mm; bulb scales white |
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9 Lilium nanum |
| + |
Style ca. 1 mm; bulb scales purple |
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10 Lilium brevistylum |
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| 23 (18) |
Leaves 12--15 cm; flowers usually 5 or 6; tepals white, with a dark purple-red blotch at base adaxially |
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13 Lilium henrici |
| + |
Leaves 2.5--8 cm; flowers usually 3 or 4; tepals variable in color, without a dark purple-red blotch at base adaxially. |
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(24) |
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| 24 (23) |
Stem papillose. |
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(25) |
| + |
Stem smooth. |
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(27) |
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| 25 (24) |
Leaves papillose at margin and on midvein abaxially; flowers 6.5--8.3 × 5.5--6 cm |
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14 Lilium bakerianum |
| + |
Leaves smooth; flowers 3.5--4 × 3--3.5 cm. |
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(26) |
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| 26 (25) |
Tepals white, with purple-red speckles basally |
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15 Lilium sempervivoideum |
| + |
Tepals purple-red or rose purple, with red spots |
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16 Lilium amoenum |
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| 27 (24) |
Leaves narrowly linear or subulate, 1--2(--3) mm wide |
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17 Lilium pinifolium |
| + |
Leaves ovate-lanceolate, narrowly elliptic, or lanceolate, 6--24 mm wide. |
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(28) |
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| 28 (27) |
Leaves 7--8 × 1.6--2.4 cm; tepals pale red |
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20 Lilium huidongense |
| + |
Leaves 2--6 × 0.6--1.5 cm; tepals purple-red. |
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(29) |
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| 29 (28) |
Tepals adaxially not speckled, basally not saccate |
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18 Lilium souliei |
| + |
Tepals adaxially speckled, basally saccate |
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19 Lilium saccatum |
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| 30 (8) |
Nectaries not papillose, sometimes with fimbriate projections. |
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(31) |
| + |
Nectaries papillose on both surfaces. |
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(42) |
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| 31 (30) |
Leaves shortly petiolate; nectaries with fimbriate projections on both surfaces. |
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(32) |
| + |
Leaves sessile; nectaries without fimbriate projections. |
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(34) |
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| 32 (31) |
Leaves similar in shape; tepals white, with purple-red blotches and spots on proximal 1/3--1/2, margin undulate |
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21 Lilium speciosum var. gloriosoides |
| + |
Leaves conspicuously dimorphic; tepals yellow or orange, margin entire. |
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(33) |
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| 33 (32) |
Leaves oblong-lanceolate, 20--27 mm wide; capsule brown, oblong, 4--4.5 × ca. 3.5 cm |
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22 Lilium henryi |
| + |
Leaves linear-lanceolate, 8--10 mm wide; capsule brownish green, narrowly oblong, 5.5--6.5 × 1.4--1.8 cm |
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23 Lilium rosthornii |
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| 34 (31) |
Tepals primrose yellow, greenish yellow, or pale yellow, rarely yellowish white or orange-yellow, unspotted. |
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(35) |
| + |
Tepals white, pale purple-red, pink, or greenish yellow, with purple-red spots. |
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(36) |
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| 35 (34) |
Leaves lanceolate, 3-veined |
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24 Lilium primulinum |
| + |
Leaves oblong-lanceolate, 5-veined |
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25 Lilium nepalense |
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| 36 (34) |
Tepals pale purple-red or pink; style at least 3 × as long as ovary; leaves narrowly lanceolate, with 3 impressed veins adaxially |
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26 Lilium wardii |
| + |
Tepals equaling or slightly longer than ovary; leaves linear or linear-lanceolate, without 3 impressed veins adaxially. |
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(37) |
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| 37 (36) |
Flower solitary. |
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(38) |
| + |
Flowers 2--5(--13) in a raceme. |
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(40) |
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| 38 (37) |
Tepals white, tinged pale brown |
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27 Lilium matangense |
| + |
Tepals greenish or greenish yellow. |
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(39) |
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| 39 (38) |
Tepals greenish yellow, with deep red spots; filaments much longer than anthers |
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28 Lilium stewartianum |
| + |
Tepals greenish, with purple spots throughout; filaments slightly shorter than anthers |
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29 Lilium habaense |
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| 40 (37) |
Leaves narrowly oblong or ovate-lanceolate, 5--11 × 1.5--3 cm |
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32 Lilium lijiangense |
| + |
Leaves linear, linear-lanceolate, or lanceolate, 5--10 × 0.8--1.5 cm. |
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(41) |
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| 41 (40) |
Tepals white, with purple spots; style subequaling or slightly longer than ovary |
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30 Lilium taliense |
| + |
Tepals white or yellow, purple at base and with purple spots apically; style ca. 2 × as long as ovary |
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31 Lilium jinfushanense |
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| 42 (30) |
Leaf axils in distal part of stem with bulblets |
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44 Lilium tigrinum |
| + |
Leaf axils without bulblets. |
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(43) |
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| 43 (42) |
Leaves narrowly lanceolate to oblong. |
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(44) |
| + |
Leaves linear. |
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(47) |
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| 44 (43) |
Tepals red, with black or purple spots and fimbriate projections. |
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(45) |
| + |
Tepals white or pink, with purple spots, without fimbriate projections. |
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(46) |
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| 45 (44) |
Plants white hispidulous |
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35 Lilium amabile |
| + |
Plants not white hispidulous, white woolly when young |
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36 Lilium leichtlinii var. maximowiczii |
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| 46 (44) |
Leaf axils with a cluster of white hairs; leaf veins not elevated abaxially; tepals white, with purple-red spots |
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33 Lilium duchartrei |
| + |
Leaf axils without hairs; leaf veins elevated abaxially; tepals pink, with deep red spots |
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34 Lilium lankongense |
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| 47 (43) |
Nectaries papillose and crested on both surfaces. |
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(48) |
| + |
Nectaries only papillose on both surfaces, not crested. |
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(50) |
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| 48 (47) |
Bulb yellow, 4.5 × 4--5 cm |
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43 Lilium xanthellum |
| + |
Bulb white, 2--3 × 1.5--2.5 cm |
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(49) |
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| 49 (48) |
Tepals purple-red to reddish brown, unspotted |
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41 Lilium papilliferum |
| + |
Tepals greenish white, with purple or purple-brown spots |
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42 Lilium fargesii |
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| 50 (47) |
Bracts thickened apically |
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40 Lilium callosum |
| + |
Bracts not thickened apically. |
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(51) |
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| 51 (50) |
Tepals bright red or white, usually unspotted, occasionally with a few spots near base. |
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(52) |
| + |
Tepals pale purple-red or orange, darker purple spotted proximally. |
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(53) |
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| 52 (51) |
Tepals bright red, not minutely papillose adaxially |
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37 Lilium pumilum |
| + |
Tepals white, minutely papillose adaxially |
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54 Lilium tianschanicum |
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| 53 (51) |
Stem densely papillose; tepals orange, 5--6 cm |
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38 Lilium davidii |
| + |
Stem not papillose; tepals pale purple-red, 3.5--4.5 cm |
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39 Lilium cernuum |
