Blackstonia {z=Chlora), Cicendia (incl. Microcala)^ 
Centaurium (z^Erythrcea), Gentiana, Meny- 
anthes, Limnanthemum (=Villarsia), 
Family 79. APOCYNACE^. Plants various 
(low shrubs in Brit, gen.), provided with abundant 
latex and bicollateral bundles. Lea. opposite, sim- 
ple, entire, usually exstipulate. Flow, (in Brit, 
gen.) solitary. Per. 4 — 5-merous ; pet. usually 
twisted. Sta. 4 — 5. Carp, usually 2, superior, free 
below but connate in the region of the style ; ovules 
00, pendulous, + anatropous ; plac. sutural. Fr. 
usually of 2 follicles. Seeds with or without endo- 
sperm. 
Vinca, ^Apocynurn, Nerium, Strophanthus, Alla- 
manda, as well as Landolphia and many other 
rubber-yielding tropical lianes.] 
C. Cor. always gamopetaloiis and often zygomor- 
phic. Only i whorl of sta. {the outer) present. 
Carp, usually (2), occasionally more, some- 
times apparently 1. 
TUBIFLOR^. RUBIALES. CUCURBITALES . 
PEANTAGINALES . CAMPANUEAT^ . 
§ I. Ovary superior. Cor. hypogynous (cf. p. 44). 
Order 5 TUBIFLORyE. 
Mostly herbs or shrubs. Per. typically 5-merous, 
with petaloid cor. Sta. epipetalous, isomerous and 
alternating with pet., but often reduced in zygo- 
morphic flow. 
^ Ovary 2 — ^-celled; plac. axile; ovules always 
few, mostly 3 or 4. 
Family 80. CONVOLVULACE^. Often twiners 
(usually to the left), rarely shrubby, frequently 
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