Variation patterns of flowers in <i>Syndiclis</i> aff. <i>marlipoensis</i>.

<p>A, an irregular tetramerous flower bud, arrow highlighting a poorly developed tepal of the inner tepal whorl (P2), the stamen of the second androecial whorl (S2) in the same orthostichy missing; B, a complex-whorled flower with trimerous plus dimerous whorls, arrow indicating a missing orthostichy including a tepal of the inner tepal whorl (P2), a stamen of the second androecial whorl (S2), and a staminode of the fourth androecial whorl (S4); C, a regular tetramerous flower bud; D, a trimerous flower, showing fusion of two adjoining stamens from the third androecial whorl (S3) and the second androecial whorl (S2). Scale bars: A and B: bar = 100 μm; C and D: bar = 200 μm.<i>Abbreviations</i>. G, gland; P1, the outer whorl of tepals; P2, the inner whorl of tepals; S1, the first/outermost whorl of stamens; S2, the second whorl of stamens; S3, the third androecial whorl including either fertile stamens or staminodes; S4, the fourth androecial whorl including staminodes.