86 DICOTYLEDONOUS. 



lyx hispid. Petals large, obliquely obovate, often hispid. Anthers long, K-* 

 near, opening at the summit. Style longer than the stamens. 

 Purple. 11-. June— Sept. In moist soils. 1-2 feet. 



2. R. Angustifolia. S^em hirsute, nearly terete, much branched, heaves 

 Unear, or lanceolate, somewhat clustered, attenuate at the base, slightly hispid, 

 setaciously ciliate, serrulate. Flowers numerous, smaller than the preceding. 

 Calyx glabrous. 



Pale purple, or nearly white. %. Damp soils. 1-2 ft. 



3. R, ViRGiNiCA. Stem square, with the angles winged, hispid, branching. 

 Leaves sessile, oval, lanceolate, acute, hispid above, and on the ribs beneath, 

 sometimes 5--7 ribbed. Flowers num.erous, axillary, and terminal. Calyx 

 hispid. Petals obovate, hispid externally. Peer Grass. 



Purple. %. July — Sept, In swamps. 2-3 ft. 



4. R. Stricta. Stem glabrous, square, angles winged, bearded at the nodes. 

 Leaves sessile, ovate, lanceolate, acuminate, setaceously serrulate, often his- 

 pid above. Flowers in dichotomous corymbs. Calyx glabrous. 



Purple %. In wei pine t5arrens. August — Sept. 3-4 ft. 



5. R. Glabella. Stem glabrous, slightly furrowed, terete, simple- Leaves 

 lanceolate, entire, or with few serratures at the summit. Flowers large- Ca- 

 lyx with glandular hairs. Petals large, glandular externally before their ex- 

 pansion. Peer Grass. 



Purple. % June — Aug. Damp woods. 2-5 ft. 



6. R. CiLiosA. Stem simple, quadrangular, glabrous. Leaves slightly 

 petioled, ovate, lanceolate, serrulate, ciliate, hispid above. Flowers in a loose 

 dichotomous panicle with an involucre formed by the upper pair of leaves ; 

 calyx glabrous. Petals nearly round. 



Purple It- June — Aug. Pine barrens. 1--2 ft. 



7. R- Sekrulata. Stem small, simple, quadrangular, glabrous. 'Leaves 

 small, ovate or oval, glabrous, serrulate and ciliate- Flowers 1--3 together. 

 Ca/w>r glandular iiispid. 



"' Purple. % June — July. Swamps. 6-- 10 in, 



8. R. LuTEA. Ste7n hirsute, square, branching, hispid- Leaves linear, 

 lanceolate, sometimes cuneate, entire. Flowers small. Calyx smooth and 

 shining, or with a few scattered bristles. Petals setaceously mucronate- 



Yellow. % Damp pine barrens. June — Aug. 12-18 in. 



Order XLIV. LYTHRACE.^. 



Calyx 4-lobed, Petals none, or four. Stamens inserted 

 into the tube of the calyx, generally in number equal to 

 the lobes. Anthers short, introrse ; ovary 2-4 celled, enclo- 

 sed in the calyx ; ovules numerous, placentae central. Cap. 

 sule membranaceous, sometimes 1-celled. Seeds numerous, 

 anatropous. Cotyledons foliaceous. Herbs with opposite 

 leaves, without stipules. 



Genus I. HYPOBRICHIA. 



Calyx 4-lobed, and sometimes with intermediate segments, 

 campanulate. Apetalous. Stameris 2-4, ovary 2.celled, glo- 

 bose. Stigma 2-lobed, nearly sessile. Capsule 2-celled, mem- 

 branous, dehiscing irregularly. Seeds numerous. An aqua- 

 tic plant with opposite linear leaves. Flowers minute, axil- 

 lary. 



