ii MONOCOTS. PANDAN ALES TRIURID ALES 



A; a; a; (3 



MONOCOTYLEDONEAE 



[Embryo with one cot.; stem with closed bundles; 1. usu. |]-veined; 

 fl. usu. 3-merous.] 

 A. Orders with predominant variability in number of floral parts 



(Orders i 7) : 



a. Typically achlamydeous fls. appear (Orders i 4). 

 a. Fls. usu. naked. Great variability in number of sta. and cpls. 



1. PANDAN ALES. Marsh herbs, or trees, with linear 1., and cpd. 



heads or spikes of naked, haplo- or homo-chlamydeous <? ? fls. 

 P bractlike, A <x> i, G oo i. Endosp. 



P. Naked fls. occur, but also all stages from achlam. to hetero- 

 cnlam. fls. , and from hypog. to epig. Number of essential 

 organs definite or not (Orders 2, 3). 



2. HELOBIAE. Water or marsh pi. with scales in axils, and cyclic 



or hemicyclic fls. P in o, i, or 2 whorls, h >mo- or httero-chlam., 

 hypog. or epig. A oo i, G oo i , free or united. Endosp. little 

 or none. 



i. Potamogetonineae: fl. hypog., achlam., haplo-, or homo- 

 chlam. (fams. i 4). 



2. Alismatitieae : fl. hypog. , usu. heterochlam.; ov. on ventral 

 suture (fam. 5). 



3. Butomineae: fl. hypog. or epig., usu. heterochlam.; ov. 

 on inner surface of cpls. (fams. 6, 7). 



JRIDALES. Saprophytes with scale 1. and small long- 

 Iked homochlam. 5 or j ? fls. P 3 8, valv., petaloid; 

 A. 3, 4, or 6; ? , i stds. G oo each with i basal ov. ; oo styles. 



ir-orr\ tVii^L- T^nr1r\cn 



TRIURIDALES. 



stalked 

 <? A . 

 Pericarp thick. Endosp. 



