KEY. 239 



66G. Flowers all with a perianth, often imbricated with 



bracts 667 



The pistillate flowers consisting of a naked, 2-styled 

 ovary, j^laced between two leafy bracts, which might be 

 mistaken for a perianth. The staminate flowers furnished 

 with a 5-sepalled perianth, also with a rudimentary j^istil. 

 Fruit an utricle. Herbs scurfy. Leaves triangular, or hal- 

 berd-shaped. Atriplex hastata, L. (826). 



067. Perianth 4-lobed. Stamens 4. Stigma sessile, 

 tufted. Leaves chiefly alternate. Many of the (generally 

 moncecious) flowers perfect. Achenium i)olished. 



Farietaria Pennsylvanica, Muhl. (831). 



Perianth of 5 sepals, silvery-white, as are the 

 bracts. Stamens 5, Avith 1 -celled anthers. Stigmas 2 or 3. 

 Leaves opposite, petioled. Utricle roundish-ovate, enclosed 

 in the perianth. Iresine celosioides, L. (896). 



668. Perianth 4-toothed, with the sinuses a2)pendiculate, 

 or 4-sepalled, with the two outer sepals smaller. Stamens 4 

 or 6. Low herbs 669 



Perianth of 4 or 5 equal, or not apj^endiculate seg- 

 ments, or sepals 670 



669. Calyx globular, or bell-shaped, 4-angled, 4-toothecl, 

 wuth a little horn-like appendage at each sinus (corolla want- 

 ing). Style 1. Stamens 4. Fruit a pod. Leaves narrow, 

 opposite. Flowers small, greenish, axillary, solitary, or 3 

 together. Stem branched. (1^4) Aininannia. 



Perianth 4-sepalled, the 2 inner sepals broader, 

 erect, the 2 outer smaller and spreading, or reflexed. Ache- 

 nium lens-shaped, girt with a broad wing. Stigmas 2, ses- 

 sile, tufted. Stamens 6. Low acaulescent herbs. Leaves 

 kidney-form, long-petioled. Flowers racemed, or somewhat 

 panicled. (85) Oxyria digyna, Campd. 



(0. reniformis. Hook.) 



670. Stamens 1-5, all fertile 671 



Stamens 6-12, the alternate ones often sterile. .684 



671. Perianth 4-parted or sepalled , . ,672 



Perianth 5- (rarely 4-) toothed, cleft, j^arted or 



sepalled 675 



