| 1 |
Plants with a solitary, early-withered basal leaf, cauline leaves 2 or 3; perianth segments 4, in 2 whorls; stamens 4; ovary 2-loculed, ovules 2 per locule |
|
1 Maianthemum bifolium |
| + |
Plants without basal leaf, cauline leaves more than 3; perianth segments 6; stamens 6; ovary 3-loculed, ovules 1 or 2 per locule. |
|
(2) |
| |
|
|
|
| 2 (1) |
Rhizome (0.7--)1--2 cm thick. |
|
(3) |
| + |
Rhizome 0.1--0.7 cm thick. |
|
(11) |
| |
|
|
|
| 3 (2) |
Ovary 3--4 × as long as style |
|
2 Maianthemum fuscum |
| + |
Ovary shorter than or subequaling style. |
|
(4) |
| |
|
|
|
| 4 (3) |
Inflorescence rachis glabrous |
|
3 Maianthemum tatsienense |
| + |
Inflorescence rachis pubescent. |
|
(5) |
| |
|
|
|
| 5 (4) |
Leaves basally cordate and clasping stem |
|
8 Maianthemum forrestii |
| + |
Leaves basally neither cordate nor clasping stem. |
|
(6) |
| |
|
|
|
| 6 (5) |
Perianth funnelform. |
|
(7) |
| + |
Perianth usually campanulate or rotate. |
|
(8) |
| |
|
|
|
| 7 (6) |
Perianth tube 6--10 mm, 2/3--3/4 as long as perianth |
|
9 Maianthemum henryi |
| + |
Perianth tube 3--4 mm, nearly 1/2 as long as perianth |
|
10 Maianthemum szechuanicum |
| |
|
|
|
| 8 (6) |
Style 2--2.5 × as long as ovary |
|
4 Maianthemum oleraceum |
| + |
Style nearly as long as ovary. |
|
(9) |
| |
|
|
|
| 9 (8) |
Perianth tube 1--2 mm, segments connate proximally |
|
7 Maianthemum atropurpureum |
| + |
Perianth tube indistinct, segments free to the base or connate for less than 2 mm. |
|
(10) |
| |
|
|
|
| 10 (9) |
Panicle with only 1 or 2 branches at base; stigma 3-lobed |
|
5 Maianthemum purpureum |
| + |
Panicle with 3 or more branches; stigma subentire |
|
6 Maianthemum japonicum |
| |
|
|
|
| 11 (2) |
Inflorescence a panicle. |
|
(12) |
| + |
Inflorescence a raceme. |
|
(13) |
| |
|
|
|
| 12 (11) |
Inflorescence 2--2.5 cm; perianth segments ca. 2.3 mm; style ca. 1 mm (Sichuan) |
|
11 Maianthemum nanchuanense |
| + |
Inflorescence 4--5 cm; perianth segments 3--4 mm; style ca. 0.5 mm (Taiwan) |
|
12 Maianthemum formosanum |
| |
|
|
|
| 13 (11) |
Flowers mostly in clusters of 2--4 |
|
13 Maianthemum dahuricum |
| + |
Flowers all solitary. |
|
(14) |
| |
|
|
|
| 14 (13) |
Inflorescence rachis pubescent. |
|
(15) |
| + |
Inflorescence rachis glabrous. |
|
(17) |
| |
|
|
|
| 15 (14) |
Perianth segments violet, free to base |
|
14 Maianthemum fusciduliflorum |
| + |
Perianth segments white or tinged violet, connate at base to form a tube 1--3 mm. |
|
(16) |
| |
|
|
|
| 16 (15) |
Perianth segments forming a long tube 2.5--3 mm; style 2.5--3 mm |
|
15 Maianthemum lichiangense |
| + |
Perianth segments forming a short tube 1--2 mm; style 0.5--1 mm |
|
16 Maianthemum tubiferum |
| |
|
|
|
| 17 (14) |
Inner perianth segments obovate, margin ciliate |
|
17 Maianthemum gongshanense |
| + |
Inner perianth segments oblong or narrowly lanceolate, margin not ciliate. |
|
(18) |
| |
|
|
|
| 18 (17) |
Inner perianth segments oblong, 2--3 mm |
|
18 Maianthemum trifolium |
| + |
Inner perianth segments narrowly lanceolate, 5--7 mm |
|
19 Maianthemum stenolobum |
