654 



PART III. THE CLASSIFICATION OF PLANTS. 



Loosestrife, has a deeply 5-cleft calyx. Trientalis, the Chickweed Winter- 

 green, has usually a 7-merous flower. The other British genera are Hottonia 

 (H. palwtris, the Water- violet), Samolus (S. Valerandi, the Brookweed), and 

 Glaux (G. maritima, the Sea Milk- wort). 



13 



FIG-. 454. Dimorphic flowers of Primula elatior in longitudinal section. A Short-styled, 

 B long-styled form ; fc calyx j c corolla ; a anthers ; / ovary j g style ; n stigma. Floral 

 diagram of Primula. 



Order 2. MYRSINACEJJ. These plants differ from the preceding 

 in that the fruit is baccate and the stem woody : a whorl of sta- 

 minodes alternating with the petals is present in some genera (e.g. 

 Theophrasta) . 



Ardisia, with red berries, is a well-known ornamental plant. 



Order 3. PLUMB AGINACE.E. Styles five : there is a single basal 

 ovule in the cavity of the ovary, pendulous on a long funicle : 

 flowers often small, in dense inflorescences with numerous bracts : 

 no trace of an external antisepalous whorl of stamens. 



In the genus Armeria the flowers are in capitula of scorpioid cymes, which are 

 surrounded by an involucre formed of the lower scarious bracts with downward 

 prolongations embracing the peduncle ; A. maritima, the Thrift, occurs on sandy 

 soils. Statice Limonium, the Sea-Lavender, with racemose cymes, occurs on 

 sandy sea-shores. Plumbago occurs in Southern Europe and in the East 

 Indies. 



Cohort VII. Ericales. Flowers 4-5-merous, actinomorphic : 

 stamens usually in two whorls and then obdiplostemonous, usually 

 hypogynous : carpels opposite to the petals : formula If(n), (7(n), 

 I -4n + n, 6r(n), where n = 4 or 5: ovary superior or inferior, 

 multilocular, with large recurved axile placentae : seed with en- 

 dosperm : anthers sometimes appendiculate (Fig. 332 B). 



