236 PBACTIGAL BOTANY. 



like, creeping, floating or submersed herbs, with a 1- or few- 

 flowered spatlie. Leaves parallel-veined 711 



Perianth herbaceous. Hushes. Flowers cymose or 

 panicled. Juncus (741). 



711. Anthers of 2 forms ; the upper 2 filaments thickened 

 in the middle, bearing ovate, yellow anthers; the lower, 

 longer one an arrow-shaped, green-colored anther. Spathc 

 3- to 5-flowered. Leaves round-rcniform. Flowers white. 

 Muddy margins of streams. Heteranthera. 



Anthers alike, oblong-arrow-shaped; filaments awl- 

 shaped. Herb growing wholly under water. Leaves linear, 

 thin, sessile. Spathe terminal, 1-flowered, rising to the sur- 

 face of the water ; flower small, pale yellow. 



Schollera grairtineaj Willd. 

 713. (704.) Ovary or ovaries superior 713 



Ovary (entirely or only half) inferior 748 



713. Tree 663 



Herbs 714 



714. Stamens separately opposite the perianth-segments. 



715 

 Stamens in pairs, opposite the 3 inner sepals. 

 Flowers perfect, or dioecious, in simple or compound 

 racemes. Perianth of 6 nearly distinct sepals, the 3 inner 

 (valves) larger, petaloid, convergent over the achenium, one 

 of them usually tubercled on the back, the 3 others herba- 

 ceous and reflexed in fruit. Styles 3, short ; stigmas tufted. 



(94) Rumex (884). 



7 15. Flowers crowded on a lateral cylindric spadix; 

 Perianth of 6 scales. Stigma minute, blunt, sessile. Ensi- 

 form leaves and leaf-like scape radical, aromatic. 



Acorus calamus, L. 



Flowers solitary, or in a terminal spike, umbel, 



simple or compound raceme, etc. 716 



716. Flowers terminal -.VSO 



Flowers axillary 717 



717. Leaves thread-like, or bristle-form. Perianth bell- 

 shaped, on a jointed pedicel, the 3 inner segments somewhat 

 broader. Ovary ovoid. Stigmas 3. Berry red. 



Asparagus officinalis, L. (890). 



