273 PIIAGTIGAL BOTANY. 



899. Styles or stigmas 2, 3, or 5 900 



Stigma 1, subulate, elongated. Sterile flowers: 

 calyx 5-parted ; stamens 5; ovary rudimentary. Fertile 

 flowers: calyx 4-sepalled, the 2 outer sepals minute, the 2 

 inner foliaceous in fruit; achenium finally reflexed on the 

 winged pedicel. Hairs stinging. Leaves broad-ovate, long- 

 petioled, rounded or slightly cordate at the base, acuminate. 

 Panicles axillary, solitary, or in spikes. 



(8;ii) Laportea Canadensis, Gaud. 



900. Stigmas 3—5. Flowers all 3-bracted. Sterile flow- 

 ers with 5 sepals and 5 stamens. Fertile flowers without a 

 calyx 901 



Styles 2. Sterile flowers bractless ; calyx of 4 or 5 

 sepals. Stamens 4 or 5. Fertile flowers 2-bracted ; bracts 

 more or less united, at length hardened and connivent ; calyx 

 none. Flowers densely glomerate. Herb mealy-canescent. 

 Leaves oval or oblong, short-petioled. 



(830) Obione arenaria, Moq. 

 (Sand Orache.) 



901. Utricle indehiscent and valveless. Stigmas 3-5, 

 shorter than the ovary, and linear-awl-shaped. Stem nearly 

 terete. Flowers in slender, axillary, and terminal spikes. 

 Leaves ovate, lanceolate, acuminate, wavy, w^edge-shaped at 

 the base, petioled. Acnida cannabina, L. 



Utricle dehiscent, circumscissile. Stigmas long, 



bristle-form, plumose-hairy. Stem angular. Flowers in 



axillary spikes. Leaves lanceolate or oblong-ovate, long- 



petioled. Montelia tamariscina, Gray. 



903. (887.) A grass and a sedge. 



Brizopyrum (613) and Carex (821). 



No grasses, nor sedges 903 



903. Herb submersed, slender, branching, with linear, 

 minutely repand-toothed, opposite leaves, and axillary flow- 

 ers. Stigmas usually 3 or 4. (818) Najas flexilis, liostk. 

 A non-aquatic, scape-bearing herb. Flowers 

 naked, on a spadix, covering its base and leaving its upper 

 ■part free. The subulate spadix in some plants with wholly 

 sterile flowers, in others with sterile and fertile ones, the 

 latter below. Spathe oblong, acuminate, convolute. Leaf 

 pedate, \vith 7-11 segments. 



Arisaema Dracontium, Schott. 



