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91. Peucedanum Linnaeus, Sp. Pl. 1: 245. 1753.

前胡属 qian hu shu

She Menglan (佘孟兰 Sheh Meng-lan); Mark F. Watson

Kitagawia Pimenov.

Herbs perennial. Rootstock short, crown usually bearing remnant leaf sheaths. Stem finely striate, dichotomously branched above. Leaves petiolate; petioles sheathing. Umbels loosely compound, terminal and lateral; bracts numerous or absent; rays numerous or few; bracteoles numerous, rarely few or absent. Calyx teeth short or obsolete. Petals usually white, occasionally pinkish or purplish, rarely pale yellow, orbicular to obovate, with a narrow inflexed apex. Stylopodium low-conic. Fruit ellipsoid, oblong to suborbicular, dorsally compressed; dorsal ribs filiform, slightly prominent, lateral ribs thickened and narrowly winged, wings closely appressed to one another; vittae 1 to several in each furrow, 2 to several on commissure. Seed face plane or slightly concave. Carpophore bipartite.

Between 100 and 200 species: Africa, Asia, Europe; 40 species (33 endemic) in China.

The taxonomy of this widespread, heterogeneous genus has long been problematic. The broad circumscription of Peucedanum adopted here includes some 100–120 species from many parts of the Old World that are weakly united by basic (especially external) fruit structure. These fruit characters are undoubtedly the result of several lines of convergent evolution, and some authors prefer to recognize several segregate genera and reduce Peucedanum to only 8–10 Eurasian species based around the nomenclatural type, P. officinale Linnaeus. As the taxonomy of this genus is still unresolved (it is currently the focus of an international, multi-disciplinary study), a traditional treatment is adopted for the following account. Several Chinese taxa are represented by only a few herbarium specimens, a few (particularly species nos. 32–40) are recorded only from the type gatherings, and specific boundaries are not always clear. The Chinese members of this genus would benefit from a detailed revision augmented with new collections. The following key excludes P. lhasense (species no. 40) because there are insufficient data.


1 Calyx teeth obsolete or inconspicuous.   (2)
+ Calyx teeth conspicuous.   (19)
       
2 (1) Bracts several or numerous, persistent.   (3)
+ Bracts usually absent or few bracts and falling early.   (9)
       
3 (2) Plants small, 5–20 cm, acaulescent; peduncles numerous; scapiform.   (4)
+ Plants tall, more than 20 cm, caulescent.   (5)
       
4 (3) Leaf blade 2–3-pinnate; bracteoles entire fruit hispid (Xizang).   2 Peucedanum nanum
+ Leaf blade 3–4-pinnatisect; bracteoles pinnate; fruit glabrous (Yunnan).   3 Peucedanum acaule
       
5 (3) Plants 50–100 cm; leaf blade 3-pinnately dissected, 3-lobed or 2-ternate.   (6)
+ Plants 20–50 cm; leaf blade 1–2-pinnate.   (7)
       
6 (5) Ultimate segments of leaves linear, entire; fruit vittae 1 in each furrow, 2 on commissure (Heilongjiang, Jilin).   1 Peucedanum elegans
+ Ultimate segments of leaves ovate or ovate-rhombic; fruit vittae 1–2 in each furrow, 2–4 on commissure (Guangxi, Jiangxi).   11 Peucedanum longshengense
       
7 (5) Bracteoles pinnate; fruit vittae (1–)2–3 in each furrow, 4–6 on the commissure (Yunnan).   4 Peucedanum delavayi
+ Bracteoles entire; fruit vittae 1(–2) in each furrow, 2 on the commissure (Sichuan).   (8)
       
8 (7) Bracts large, 3-lobed or pinnate; fruit glabrous (N Sichuan).   12 Peucedanum songpanense
+ Bracts small, undivided; fruit pubescent (W Sichuan).   32 Peucedanum torilifolium
       
9 (2) Stem stout, hollow.   (10)
+ Stem stout or slender, solid.   (11)
       
10 (9) High altitude (above 2500 m) plants, leaves green; fruit ca. 8 × 6 mm, glabrous; vittae large, 1 in each furrow, 2 on commissure (SW China).   5 Peucedanum angelicoides
+ Coastal plants, leaves glaucous; fruit to 6 × 4 mm, pubescent; vittae small, 3–5 in each furrow, 6–10 on commissure (E, S, and SE China).   13 Peucedanum japonicum
       
11 (9) Ultimate segments of leaves narrow, linear, less than 0.5 mm wide.   (12)
+ Ultimate segments of leaves variously shaped, more than 4 mm wide.   (14)
       
12 (11) Synflorescence many-branched, corymbose; fruit vittae 1 in each furrow, 2 on the commissure (NE China).   6 Peucedanum stepposum
+ Synflorescence little-branched; fruit vittae 2–3 in each furrow, 6 on the commissure.   (13)
       
13 (12) Rays 3–6; lateral wings of fruit very narrow (Sichuan).   33 Peucedanum veitchii
+ Rays 10–15; lateral wings of fruit broad (Nei Mongol).   34 Peucedanum pricei
       
14 (11) Leaf blade 3–4-pinnate; petiole 15–33 cm.   (15)
+ Leaf blade 1–2-ternate or 2–3-pinnate; petioles 3–15 cm.   (17)
       
15 (14) Bracteoles 8–12, ovate-lanceolate (Chongqing).   8 Peucedanum wulongense
+ Bracteoles less than 7, linear or subulate.   (16)
       
16 (15) Rays 12–16; umbellules 10–20-flowered (Chongqing, Hubei).   7 Peucedanum dielsianum
+ Rays 5–7; umbellules 5–10-flowered (SW China).   35 Peucedanum chinense
       
17 (14) Leaf blade narrowly ovate; ultimate segments narrow, linear, oblanceolate or obovate, 1–2.5 × 0.5–1 cm (Gansu, Sichuan).   9 Peucedanum turgeniifolium
+ Leaf blade triangular-ovate or broadly triangular; ultimate segments usually large, rhombic-obovate or long-ovate, 1.5–7 × 1.2–5 cm.   (18)
       
18 (17) Leaflets sharply serrate with setaceous teeth; bracteoles longer than flowers; fruit densely hispid (S and SE China).   10 Peucedanum formosanum
+ Leaflets coarsely toothed or crenate-dentate; bracteoles shorter than flowers; fruit sparsely puberulent (widespread in China).   14 Peucedanum praeruptorum
       
19 (1) Lateral wings of fruit very narrow, less than 1/3 width of the body, thick.   (20)
+ Lateral wings of fruit rather broad, thin, ca. 1/3 as wide as body.   (27)
       
20 (19) Leaf blade 1- to several-pinnate or pinnately dissected.   (21)
+ Leaf blade ternate-1–2-pinnate or 2–3-ternate.   (24)
       
21 (20) Leaf dissection diffuse; ultimate segments of basal leaves linear elongate, usually 3–10 × 0.1–0.3 cm; flowers pale yellow (Xinjiang).   31 Peucedanum morisonii
+ Leaf dissection compact; ultimate segments of basal leaves much shorter and broader; flowers white.   (22)
       
22 (21) Stems many, often diffuse-caespitose; fruit vittae 1–2 in each furrow, 2 on commissure (N China).   17 Peucedanum caespitosum
+ Stems several or solitary, not diffuse-caespitose; fruit vittae (1–)2–4 in each furrow (2–)4–6 on commissure (SW China).   (23)
       
23 (22) Leaf sheath auriculate at apex; bracts 2–3, unequal, occasionally pinnate; rays 12–20; bracteoles 6–8, linear, undivided or 3-incised to pinnate (Sichuan, Yunnan).   19 Peucedanum macilentum
+ Leaf sheath not auriculate at apex; bracts 6–10, linear, equal; rays 24–40; bracteoles 10, linear or linear-lanceolate (Sichuan, Yunnan).   20 Peucedanum rubricaule
       
24 (20) Basal leaves densely pubescent on both surfaces; rays 10–15, densely tomentose or hispid all round (Sichuan, Yunnan).   18 Peucedanum pubescens
+ Basal leaves glabrous sparsely pubescent; rays 5–8 or 15–34, inner faces pubescent or glabrous, outer faces glabrous.   (25)
       
25 (24) Umbels small, 1–4 cm across; rays less than 2 cm (Anhui, Jiangsu, Shandong).   16 Peucedanum wawrae
+ Umbels large, 8–15 cm across; rays more than 5 cm.   (26)
       
26 (25) Rays 15–34; bracteoles 10–16 (Shaanxi).   15 Peucedanum ampliatum
+ Rays 5–6; bracteoles absent (Hubei).   36 Peucedanum henryi
       
27 (19) Bracts 3–10, persistent.   (28)
+ Bracts absent, occasionally few but falling early.   (29)
       
28 (27) Bracteoles pinnate (NE China).   37 Peucedanum piliferum
+ Bracteoles linear, entire (Henan, Shaanxi).   38 Peucedanum ledebourielloides
       
29 (27) Leaf blade 2–3-ternate, rarely 2-pinnate; primary umbels large, 7–15 cm across (C and S China).   30 Peucedanum medicum
+ Leaf blade 1- to several-pinnate or pinnately dissected; primary umbels smaller, usually less than 7 cm across.   (30)
       
30 (29) Rays roughened or pubescent on all sides, or glabrous.   (31)
+ Inner faces of rays strigose or pubescent, outer faces glabrous.   (34)
       
31 (30) Whole plant glabrous; ultimate segments of leaves elongate-linear (Xinjiang).   24 Peucedanum falcaria
+ Plant puberulent, at least around nodes and rays; ultimate segments of leaves not elongate-linear.   (32)
       
32 (31) Stem solid, with pith (Guangxi).   28 Peucedanum mashanense
+ Stem hollow.   (33)
       
33 (32) Fruit vittae 3–4 in each furrow, 8 on commissure (Xizang).   27 Peucedanum violaceum
+ Fruit vittae 1 in each furrow, 2 on commissure (Yunnan).   39 Peucedanum yunnanense
       
34 (30) Leaf blade 2–3-pinnately dissected; ultimate segments small, linear and entire (N and NE China).   23 Peucedanum baicalense
+ Leaf blade 1–4-pinnate or pinnately dissected; ultimate segments large, ovate, rhombic, obovate or ovate-lanceolate.   (35)
       
35 (34) Fruit vittae 1 in each furrow, 2–4 on commissure.   (36)
+ Fruit vittae 1–4 in each furrow, 4–10 on commissure.   (37)
       
36 (35) Plants large, 30–120 cm; stem solid, with pith; leaf blade 2–3-pinnate/pinnatifid (N and NE China).   21 Peucedanum terebinthaceum
+ Plant small, 20–30 cm; stem hollow; leaf blade pinnate (Yunnan).   22 Peucedanum franchetii
       
37 (35) Fruit large, 6–8 × 3.5–4.2 mm, glabrous (Chongqing, Guizhou, Sichuan).   25 Peucedanum dissolutum
+ Fruit smaller 4–5 × 3–4 mm, pubescent.   (38)
       
38 (37) Leaf blade broadly triangular-ovate, 3-pinnate/pinnatifid, pubescent (sometimes sparsely), papery (N, NE, and NW China).   26 Peucedanum harry-smithii
+ Leaf blade ovate-oblong, 2-pinnate, glabrous, thinly coriaceous (Guangxi).   29 Peucedanum guangxiense

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