LV. ONAGRACEiE. 26.1 



5 L. viRGATUM. Austrian Lythrum.~St. erect, branched, virgate ; Ivs. lan- 

 ceolate, acute at each end, flor.al ones small ; fis. about 3 in each axil of the vir- 

 gate raceme; sta. 12.— A fine species for the garden, native of Austria. Stem 

 3 — 4fhigh. Flowers purple. Jn. — Sept. "I- 



3. DE^CODON. Gmel, 

 Gr. StKa, ten, oiovi, atoqth; from the horn-like teeth of the calyx. 



Calyx short, broadly campanulate, with 5 erect teeth, and 5 elon- 

 gated, spreading, horn-like processes ; stamens 10, alternate ones very 

 long ; style filiform ; capsule globose, included, many-seeded. — % Lis 

 opposite or verticlllate, entire. Fls. axillary .^ purple. 



D. vERTiciLr.ATfM. Ell. (Lytlirum. Linn. Nesrea. Kimth.) 

 Swamps throughout the IJ. S. and Can. Stem woody at base, often pros- 

 trate, and rooting at the summit, 3 — 8f in length, or erect and 2 — 3f high, 4—6 

 angled. Leaves opposite or in whorls of 3, lanceolate, on short petioles, acute 

 at base, 3 — 5' long, gradually acuminate and acute at apex. Flowers in axil- 

 lary, subsessile umbels of 3 or more, apparently whorled, constituting a long, 

 leafy, terminal and showy panicle. Petals 5 or 6, large, and of a fine purple! 

 Jl. Aug. 



o. pubescens. — St. and Ivs. beneath pubescent. R. Island. 



/?. IcEvigatum. — Glabrous and bright green. Most common in N. Eng. 



4. CUPHEA. 



Gr. KVipos, curved or gibbous ; in reference to the capsule. 



Calyx tubular, ventricose, with 6 erect teeth, and often as many 

 intermediate processes; petals G — 7, unequal; stamens 11 — 14, 

 rarely 6 — 7, unequal ; style filiform ; capsule membranaceous, 1 — 2' 

 celled, few-seeded. — Herbaceous or svffruticose. Lvs. opposite., entire. 

 Fls. axillary and terminal. 



C. viscosissiMA. Jacq. (Lylhrum petiolatum. Linn.) 

 Herbaceous, viscid-pubescent; lis. ovate-lanceolate, petiolate, scabrous; 

 fls. on short peduncles; cat. gibbous at base on the upper side, 1'2-veiTied, 

 6-toothed, very viscid. — (T) Wet grounds, Pittsfield, Mass., Hitchcock, Cam- 

 bridge, N. Y., Stevenson, to Ga. and Ark. Stem 9 — 18' high, with alternate 

 branches. Leaves somewhat repand, 1 — 2' long, J as wide, on petioles | aa 

 long. Flowers solitary, one in each axil, irregular. Calyx often purple, ven- 

 tricose. Petals violet, obovate. Stamens included. Capsule bursting length- 

 wise before the seeds are ripe. Aug. 



5. HYPOBRICHIA. Curtis. 

 Calyx 4-lobed, without accessory teeth ; petals ; stamens 2 — 4 ; 

 ovary 2-celled ; stigma 2-lobed, sulDsessile ; capsule globose, bursting 

 irregularly, many-seeded. — A subviersed aquatic herb. Lvs. opposite, 

 crowded.^ linear. Fls. axillary., sessile, nmiute. 

 H. NuTTALLii. Curt. (Peplis diandra. Niitt.) 



A little inhabitant of ponds and sluggish streams, 111., Mead, Buckley, to 

 Mo. and La. Its habit is similar to a Callitriche. Stem mostly submersed, 

 10 — 20' long. Leaves 10 — 15" by 1 — 2", very numerous. Jn. — Aug. 



Order LV. ONAGRACE^.— Onagrads. 



plants herbaceous, sometimes shrubby, with alternate or opposite leaves. 

 Vis. axillary, or in terminal spikes or racemes. 



Crt/.— Sepals 4, (2 — 6> united below into a tube, the lobes valvate in »stivation. 



Cor.— S Petals 4, (2— «) inserted with the 4 or 8 (1—2—3—8) stamens into the throat of the calyx. Pollen 

 Bta.— I triauif ular, often cohering by threads. 

 Ova. coherent with the tube of the calyx ; placenta in the axis. 

 JV. baccate or capsular, 2—4 celled, many-seeded. Albumen none. 

 Genera 36, species 520, particularly abundant throughout America, more rare in the Old World They 



