Fig. 4
From: Floral morphology and phenology of Sassafras tzumu (Lauraceae)
Phenology and morphological changes of flowers of Sassafras tzumu (Hemsl.) Hemsl. A, female phase, a newly opened flower displaying closed anthers, green fresh glands, and green staminodes secreting nectar; B, female phase, staminodes turn red, stamens of the third whorl bending inwards, staminal glands secreting nectar; C, female phase, staminodes and stamens of the third whorl enclosing the central pistil, stamens of the two outer whorls curving upwards; D, male phase, anther locules open; E, glands turn red at the end of pollination; F, flower withered. Abbreviations: g, glands; p, pistil; s1, the first whorl of stamens; s2, the second whorl of stamens; s3, the third whorl of stamens; st, staminode; t1, the first whorl of tepals; t2, the second whorl of tepals. Photos by Zhi Yang