1	Style slender; stigma mallet-shaped, rarely clavate, 1-1.5 mm, shorter and narrower than anthers; racemes usually 3-7(-14)-flowered, lowest ones l-3-flowered.		(2)
+	Style robust; stigma clavate, oar-shaped, or spatulate, subequaling or longer than anthers; racemes (5-)7-11(-30)-flowered, usually lowest ones (2-)4- or 5-flowered in cymes or panicles.		(12)
2 (1)	Pedicel and calyx densely appressed white hairy.		(3)
+	Pedicel and calyx glabrous or sparsely hairy.		(5)
3 (2)	Leaf blade abaxially glabrous or villous to glabrescent when young, apex acute; calyx densely erect villous		11 P. dasycalyx
+	Leaf blade abaxially hairy, apex abruptly acuminate; calyx densely appressed strigose.		(4)
4 (3)	Anthers glabrous		9 P. incanus
+	Anthers setose		10 P. reevesianus
5 (2)	Inflorescence rachis and calyx purple or dark brown; calyx obscurely veined, sometimes glaucous.		(6)
+	Inflorescence rachis and calyx yellowish green or yellowish brown when dry; calyx conspicuously veined, not glaucous.		(7)
6 (5)	Calyx sparsely pubescent to glabrescent, tube urn-shaped		7 P. purpurascens
+	Calyx sparsely strigose, tube campanulate		8 P. kansuensis
7 (5)	Style slightly divided, glabrous; disc glabrous.		(8)
+	Style divided for 1/2 its length or more, base hairy; disc glabrous or sometimes hairy.		(10)
8 (7)	Calyx sparsely villous		3 P. tenuifolius
+	Calyx glabrous.		(9)
9 (8)	Leaf blade glabrous on both surfaces or only abaxially hairy at vein axils; racemes 5-7-flowered, rachis 3-5 cm		1 P. pekinensis
+	Leaf blade strigose adaxially and villous abaxially at vein axils; racemes 3-5-flowered, rachis 2-2.5(-4) cm		2 P. brachybotrys
10 (7)	Petals suborbicular, hairy near base abaxially		6 P. laxiflorus
+	Petals obovate or oblong-obovate, glabrous.		(11)
11 (10)	Racemes 5-7-flowered; leaf blade elliptic-ovate or ovate		4 P. schrenkii
+	Racemes 9-14-flowered; leaf blade broadly ovate or broadly ovate-elliptic		5 P. tsianschanensis
12 (1)	Leaf blade densely hairy abaxially.		(13)
+	Leaf blade hairy abaxially or only along veins.		(17)
13 (12)	Calyx densely gray-yellow strigose		12 P. kunmingensis
+	Calyx glabrous or sparsely hairy, sometimes hairy only along angles of tube.		(14)
14 (13)	Leaf blade caudate-acuminate at apex.		(15)
+	Leaf blade acute or acuminate at apex.		(16)
15 (14)	Style apically divided for 1/3-2/3 its length; leaf blade margin remotely serrulate		13 P. tomentosus
+	Style entire or only slightly divided; leaf blade margin coarsely triangular serrate		14 P. lushuiensis
16 (14)	Calyx tube 4-angled in cross section, pubescent along angles		16 P. tetragonus
+	Calyx tube not angled in cross section, glabrous		15 P. delavayi
17 (12)	Calyx glabrous.		(18)
+	Calyx hairy.		(19)
18 (17)	Leaf blade adaxially strigose; branchlets, inflorescence, and calyx yellow-brown or brown, not glaucous		21 P. zhejiangensis
+	Leaf blade adaxially glabrous or bristly; branchlets, inflorescence, and calyx purple, glaucous		22 P. calvescens
19 (17)	Calyx lobes oblong-lanceolate, apex caudate, tail 2-3 mm; leaf blade membranous, base rounded or subcordate		17 P. caudatus
+	Calyx lobes ovate or ovate-lanceolate, apex acuminate or acute, acumen 1-1.5 mm; leaf blade papery, base cuneate or broadly so.		(20)
20 (19)	Calyx tube golden yellow or grayish yellow villous; style hairy as calyx; leaf blade villous abaxially along veins		18 P. subcanus
+	Calyx tube white bristly or strigose; style glabrous, rarely hairy; leaf blade scabrid-hirsute abaxially along veins.		(21)
21 (20)	Leaf blade ovate, ovate-oblong, or lanceolate		19 P. henryi
+	Leaf blade elliptic or elliptic-lanceolate, rarely ovate-elliptic		20 P. sericanthus