58 ORDER 20. PORTULACACE^E. 



4 P. Baldwin!! Chapm. Diffusely branched, procumbent; leaves linear-lanceolate, 



very acute, all opposite ; flowers longer than the setaceous stipule!?, mostly terminal, 

 stalked ; stam. 5. Dry fields, Fla. Ga. 610'. Lvs. few. July Oct. 



5 P..Canadensis. Stem erect, slender, pubescent, many times forked, with slender 



or capillary branches ; Ivs. lanceolate, the ramial alternate : style none ; utricle equal- 

 ling the sepals. Woody hills. 



/3. ptiniila. Dwarf (2 40, tufted ; fls. closely sessile ; style as long as ovary, forked 

 at apex. Dry hills, Md. (Mr. Shriver.) 



16. SIPHONYCHIA, Torr. and Gr. (Si<pa>v, a tube; that is, Anyrtfa 

 with a tubular calyx.) Sep. linear, petaloid above, coherent into a tube 

 below, unaimed. Pet. 5 setoe alternate with the stamens on the throat of 

 the calyx. Style filiform, minutely bifid ; utricle included. (T) Diffuse and 

 widely spreading. Fls. in glomerate, terminal cymes, white. Jn. Oct. 



Calyx tube bristly with hooked hairs. Stems prostrate, diffuse Nos. 1, 2 



Calyx smooth or merely pubescent. Stems erect Nos. 3, 4 



1 S. Americana T. & G. Sts. pubescent in lines ; Ivs. lanceolate; sep. rounded, in- 



curved at apex ; fls. solitary and clustered. S. Car. to Fla. 1 2f. LVP. small. 



2 S. dlffusa Chapm. Pubescent; Ivs. lanceolate, obtuse; sep. linear, mucronate ; fls. 



in dense cymes. Pine-barrens, Fla. If. 



3 S. erecta Chapm. Sts. smooth, rigidly erect, subsimple ; Ivs. linear ; sep. lanceolate, 



tube smooth, furrowed. 2| Sands, Fla. 6 12'. 



4 S. Rug'elii Chapm. Erect, dichotomous, pubescent ; lv. oblanceolate ; sep. conspic- 



uously mucronate, the tube hairy. E. Fla. If. (Paronychia, Shutt.) 



17. SCLERANTHUS, L. KNAWEL. (SxtypoS, hard, av$o$; the 

 calyx hardens in fruit.) Sep. 5, united below into a tube contracted at the 

 orifice. Pet. 0. Sta. 10, rarely 5 or 2. Styles 2, distinct. Utricle very 

 smooth, enclosed in the hardened calyx tube. (T) A prostrate, diffuse little 

 weed, exstipulate. 



Km u mm us L. Dry fields and roadsides, N. and M. 3 6'. Lvs. linear, acute, short, 

 partially united at their bases. Fls. very small, green, in axillary fascicles. July. 



18. MOLLUGO, L. CARPET-WEED. Calyx of 5 sepals, inferior, united 

 at base, colored inside. Cor. 0. Sta. 5, sometimes 3 or 10. Fil. setaceous, 

 shorter than and opposite to the sepals. Anth. simple. Caps. 3-celled, 3 

 valved, many-seeded. Seeds reniform. Lvs. at length apparently verticil- 

 late, being clustered in the axils. 



Iff. vertlcillata L. Lvs. cuneiform, acute ; st. prostrate, branched : pedicels 1-flow- 

 ered, subumbellate ; sta. mostly but 3. Dry fields. 6 10'. White. 



ORDER XX. PORTULACACE^. PURSLANES. 



Herbs succulent or fleshy, with entire leaves, no stipules, and regular 

 flowers. Sepals 2, united at base. Petals 5, more or less imbricated. Sta- 

 mens variable in number, but opposite the petals when as many. Ovaries 

 free, 1-celled. Styles several, stigmatous along the inner surface. Fruit a 

 pyxis, dehiscing by a lid, or a capsule, loculicidal, with as many valve? as 

 stigmas. Seeds with a coiled embryo. Figs. 122, 123. 



