344 Hartog, Organogenic Notes. 



Vatica and Hopea; as Bai Hon (Hist. PI. Vol. IV. p. 205) notes 

 that the outer alternipetalous stamens in Vatica are smaller. 



Malvacece. § JDurionece. — I examined the flowers of a large 

 tree of Durio zibethinus , which though flowering abundantly never 

 ripened fruit with us, though specimens in adjoining districts 

 fruited freely. The sepals were quincuncial in origin; the petals 

 simultaneous ; the andrcecium exactly as in Payer's figure of Tilia 

 (Organog. z. 74), i. e. a large tubercle arising in front of each petal 

 on which an apical stamen forms; others forming right and left 

 in descending order, until finally the adjacent rows of two neigh- 

 bouring petals meet in the sinus in front of the sepal. 



As regards the 4-lobed involucre, my notes regard it as 

 equivalent to 2 opposite bractlets with their adjacent stipules 

 fused. In support of this the development shows that the two 

 rudiments occupying the position which opposite bractlets should 

 have are at first larger (and presumably earlier in origin) 

 than the other (stipuline) pair; and also I have seen 

 cases in Durio where the stipule of one foliage-leaf was 

 adnate half way up to the adjacent stipule of the next higher 

 leaf. This Observation is the more worthy of record, seeing that 

 Eichler (Blüthendiag. II. 286) rejects Payer's view that the invo- 

 lucre of the Malvacece is composed of bractlets -\- their stipules 

 on the ground that the involucral leaves are uniform („so gut wie 

 einander gleich sind"), and that if they were stipules cases should 

 be found in which the alleged stipules were smaller. Now Durio 

 is just a case in point. 



Malpighiacece. — In this order one or more of the sepals 

 bears a pair of dorsal glands, of the morphology of which 1 find 

 no notice. They are evidently equivalent to the pair of glands 

 found on the petiole or near the base of the blade of the foliage 

 leaves. In Hiptage Madablota there is but a single gland in the 

 flower, alternisepalous] this must be forraed from the union of two 

 glands pair of adjoining sepals ; for the petiolar glands of this plant are 

 both well developed, and much frequented by anta. Indeed the use of 

 the petiolar glands generally seems to be to induce the protective 

 Visits of ants. 



Lythracece. — Duabanga indica. The inflorescence here is one 

 of those thyrsiform inflorescences like the Lilac, which it is 

 impossible to distinguish as Cyme or Botrya; every axis ends in 

 a flower and the branching is from the axil of opposite bractlets; 

 however all but the last ramifications bear more than one pair of 

 these bractlets. The calyx varies from 4 to 6 sepals. When 

 there are 4, they stand 2 lateral and 2 antero posterior; they 

 soon enlarge and arch inwards meeting valvately and sending 

 downwards processes exactly like those of the corresponding stage 

 in Punica granatum (Payer, z. 99 figs. 2 — 4). At the same time 

 the receptacle widens greatly becomiiig 4- to 6-angular, with the 

 sides corresponding with the bases of the sepals. 4 petals 

 form at the angular points; they long remain minute and deltoid. 

 The stamens appear just within the bases ofthe sepals in a single 



