236 PRACTICAL BOTANY. 



like, creeping, floating or submersed lierbr^, with a 1- or few- 

 flowered spatlie. Leaves parallel-veined 711 



Perianth herbaceous. Rushes. 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, 

 lono-er one an arrow-shaped, green-colored anther. Spathe 

 3- to 5-flowered. Leaves round-reniform. 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-flowcred, rising to the sur- 

 face of the water ; flower small, pale yellow. 



SchoUera graminea^ Willd. 

 719. (704.) Ovary or ovaries suj^erior 713 



Ovary (entirely or only half) inferior 748 



713. Tree C63 



Herbs 714 



714. Stamens separately oj^posite the perianth-segments. 



715 



Stamens in pairs, opposite the 3 inner sepals. 

 Flowers perfect, or dioecious, in sinij^le or compound 

 racemes. Perianth of G 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). 



715. Flowers crowded on a lateral cylindric spadix. 

 Perianth of G scales. Stigma minute, blunt, sessile. Fusi- 

 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 720 



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). 



