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FOC | Family List | FOC Vol. 16 | Gentianaceae

7. Gentiana Sect. Isomeria Kusnezow, Trudy Imp. S.-Petersburgsk. Obshch. Estetvoisp., Otd. Bot. 24(2): 198. 1894.

匍茎组 pu jing zu

Perennials, with stolons, without well-developed caudices, stout rhizomes, or persistent taproots. Stems branching sympodially; flowering stems arising singly from slender stolons, often creeping and rooting at lower nodes. Inflorescences terminal. Flowers usually sessile, solitary or in few-flowered clusters. Stigma lobes free, recurved, linear or oblong. Seed coat alveolate, with simple and shallow or spongy and complex hexagonal pits.

Eighteen species: North America, Asia; 16 species in China.

1 Margin of leaves and calyx lobes conspicuously whitish, membranous or cartilaginous.   (2)
+ Margin of leaves and calyx lobes neither membranous nor cartilaginous (leaf margin cartilaginous in G. tubiflora).   (7)
2 (1) Leaf blade lanceolate, broadly oblong, elliptic, or ovate, apex acuminate to obtuse.   (3)
+ Leaf blade obovate to flabelliform, apex rounded to truncate and emarginate.   (5)
3 (2) Margin of leaves and calyx lobes membranous, scabrous   85 Gentiana depressa
+ Margin of leaves and calyx lobes cartilaginous, smooth.   (4)
4 (3) Corolla 4.5-6 cm, blue-purple; stamens equal   86 Gentiana amplicrater
+ Corolla 2.5-2.8 cm, pale blue; stamens unequal   87 Gentiana confertifolia
5 (2) Margin of leaves membranous, minutely lacerate   88 Gentiana lacerulata
+ Margin of leaves cartilaginous, not lacerate.   (6)
6 (5) Margin of leaves and calyx lobes minutely papillate; corolla 1.5-2 cm; seeds 1.3-1.5 mm   90 Gentiana emodii
+ Margin of leaves and calyx lobes smooth; corolla 2-3 cm; seeds 2.3-2.5 mm   89 Gentiana urnula
7 (1) Flowers several in a subcapitate inflorescence; petiole of upper leaves conspicuously widened.   (8)
+ Flowers generally solitary; petiole slender.   (11)
8 (7) Upper pairs of leaves as long as or longer than flowers, clustered, enveloping much of inflorescence; petiole longer or slightly shorter than blades   81 Gentiana sikkimensis
+ Upper pairs of leaves shorter than flowers, enveloping only base of inflorescence; petiole poorly defined or much shorter than blades.   (9)
9 (8) Corolla 2-2.6 cm; calyx lobes spreading to recurved; flowering stems erect, without adventitious roots; style 1-2 mm   82 Gentiana elwesii
+ Corolla 2.6-3.5 cm; calyx lobes erect; flowering stems decumbent, with adventitious roots from lower nodes; style 3-5 mm.   (10)
10 (9) All leaf blades ovate-oblong to ovate-orbicular; stems papillate; corolla 3-3.5 cm   83 Gentiana chinensis
+ Upper stem leaf blades spatulate to obovate; stems smooth; corolla 2.6-3 cm   84 Gentiana harrowiana
11 (7) Calyx lobes oblanceolate-spatulate to orbicular-spatulate, base distinctly narrowed.   (12)
+ Calyx lobes not oblanceolate-spatulate to orbicular-spatulate, base scarcely or not at all narrowed.   (13)
12 (11) Corolla 3-3.5(-4.5) cm, with dark blue stripes and spots   92 Gentiana gilvostriata
+ Corolla 4.5-5.5 cm, without stripes or spots   91 Gentiana stragulata
13 (11) Style 7-14 mm, longer than ovary, filiform.   (14)
+ Style 1.5-5 mm, shorter than ovary, cylindric.   (15)
14 (13) Leaf blade spatulate to obovate, apex rounded; calyx lobes lanceolate to narrowly oblong, apex subacute to obtuse   93 Gentiana filistyla
+ Leaf blade oblong to elliptic, apex acute to obtuse and sometimes caudate; calyx lobes ovate to triangular, apex acute and sometimes caudate   94 Gentiana tubiflora
15 (13) Corolla 3-3.5 cm.   (16)
+ Corolla to 2.6 cm.   (17)
16 (15) Stolons well developed; leaf blade ovate-elliptic to ovate-orbicular; style 4-5 mm   83 Gentiana chinensis
+ Stolons poorly developed; leaf blade spatulate to obovate; style 1.5-2.5 mm   96 Gentiana wardii
17 (15) Stolons well developed; leaf blades of flowering stems narrowly elliptic to ovate-elliptic, those of stolons linear to linear-lanceolate   95 Gentiana namlaensis
+ Stolons poorly developed; leaf blades all spatulate to obovate   96 Gentiana wardii

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