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- anthers not awned at apices. 花药无芒在顶端。
- anthers not awned, not pubescent at apices. 花药而不是具芒，不短柔毛的在顶端。
- anthers minutely puberulent, not awned but pubescent at apices. 除了短柔毛在顶端，花药稍被微柔毛，无芒。
- anthers oblong, thecae each dehiscing by an elongate slit, awned at apex; 花药长圆形，囊各自通过一拉长裂缝开裂，具芒的在先端；
- Seeds numerous, hairy throughout or awned at apex; 种子多数，全部被毛或在先端具芒；
- Anthers basifixed, thecae parallel, not confluent at apex; bracts 2, forming a globose to ovoid involucre. 花药基着，囊平行，不汇合的在先端；苞片2，形成一球状到卵球形总苞。(45
- Anthers dorsifixed, thecae divaricate, confluent at apex; bracts 2, not forming an involucre, rarely up to 7 and whorled, 1, or absent. 花药背着，囊极叉开，汇合的在先端；苞片2，不形成一总苞，和轮生的可达7的很少，1，或无。(46
- Sepals not aristate at apex, persistent. 萼片并非具芒的在先端，宿存。
- Staminal column shorter than corolla, 5-toothed at apex, with anthers at base. 雄蕊柱短于花冠，5齿状在先端，带有花粉囊在基部。
- Nectaries 2--3 mm; style lobes 2--3 mm; bracts not cirrose at apex. 蜜腺2--3毫米；花柱裂片2--3毫米；苞片而不是有卷须的在先端。(18
- Flowers solitary at apices of leafy branchlets. 生叶的小枝的花单生在顶端。
- Style 1, simple to 3-fid; anthers not reniform, with 2 separate locules. 花柱1，对3半裂单；花药不肾形，具分开子房室。(7
- Stem many and longer branched. Petaline claw usually not geniculate at apex. 茎很多和长分枝。花瓣状瓣爪通常不膝曲的在先端。
- Herbs annual; anthers with a slender, mucronate appendage at apex; leaves spinose at apex. 一年生草本花药具一纤细，短尖的附属物在先端；叶具刺的在先端。
- Capsule trigonous, ca. 2 mm, hirsutulous at apex. 三棱的蒴果，约2毫米，具微糙硬毛在先端。
- Carpophore deeply bifid at apex. 果瓣柄在先端2深裂。
- Utricles ovoid, 1.5-2 mm, circumscissile at apex. 胞果卵形体，1.;5-2毫米，周裂的在先端。
- Anthers not locellate; current year branchlets pubescent when young, soon glabrescent; leaf blade abaxially glabrous. 花药不具分格当年小枝幼时具短柔毛，不久后脱落；叶片背面无毛。
- Capsule fusiform, dehiscent at apex. 蒴果纺锤形，在先端开裂。
