672 CONVOLVULACEAE (CONVOLVULUS FAMILY) 



persistent around the capsule; stamens included; scales short, broad, crenu^ 

 late, shorter than the globose ovary. Flax-fields; in Europe very injurious ; 

 sparingly introduced with flax-seed into the Northern States. June-Aug. 

 (Introd. from Eu.) 



2. C. EpfxHYMUM Murr. Stems very slender ; flowers whitish or pinkish, 

 capitate ; corolla-lobes spreading, the cylindrical tube longer than the suberect 

 acute sepals ; scales large, contiguous, toothed ; stamens exserted. ( C. Trifolii 

 Bab.) Occasionally found on clover, etc. July, Aug. (Introd. from Eu.) 



* * Styles shorter than the ovary and capsule. 



3. C. EUROPAiiA L. Slender ; flowers subglobose, in dense globular clusters ; 

 corolla 4-5-parted, the lobes obtuse ; scales truncate or bifid, very small and 

 thin or seemingly obsolete ; calyx with obtuse lobes ; capsule comparatively 

 large, often loosely capped by the old corolla. On Solidago, Viburnum, etc., 

 in a hedge-row, Gilead, Me. (Miss Furbish). July, Aug. (Adv. from Eu.) 



2. Stigmas capitate; capsule indehiscent. 

 * Calyx gamosepalous ; ovary and capsule depressed-globose. 



- Flowers in dense or globular clusters ; corolla with short and wide tube, per- 

 sistent at the base of the capsule; styles mostly shorter than the ovary. 



4. C. obtusiflbra HBK. Stems coarse, orange-colored; flo wers white, 2-3 in m. 

 long ; lobes of calyx oblong, obtuse, of corolla obtuse or acutish, often longer 

 than the tube ; scales small, 2-cleft, often reduced to a few teeth ; the thin cap- 

 sule pale greenish-yellow. ( C. chlorocarpa and C. Polygonorum Engelm. ) Wet 

 places, Del. and Pa. to Minn., andsouthw.; often on Polygonum. July-Sept. 

 (Trop. Am., Eurasia.) 



5. C. arv6nsis Beyrich. Stems pale and slender, low ; flowers smaller (1.5-2 

 mm. long) ; calyx-lobes (5) obtuse, mostly very broad ; lobes of the corolla acu- 

 minate, longer than the tube, with inflexed points ; scales large, deeply fringed. 

 Rather dry soil, on various low plants, Mass., westw. and south w. July-Oct. 



H- -t- Flowers in panicled often densely compound cymes ; styles slender, mostly 

 longer than the ovary ; corolla withering on the summit of the large capsule. 



6. C. Cephalanthi Engelm. Stem coarse and yellow, usually rather high- 

 climbing ; flowers 2 mm. long, on short thick pedicels, often 4-merous ; lobes of 

 calyx and corolla oblong, obtuse, the latter mostly shorter than the slender 

 deeply campanulate tube ; scales shorter than the tube, fringed. (C. tenuiflora 

 Engelm.) On tall herbs and shrubs, Pa. to Minn., and south w. July, Aug. 



** Calyx gamosepalous; ovary and capsule pointed, the latter enveloped or 

 capped by the marcescent corolla ; flowers in loose panicled cymes. 



- Acute tips of the corolla-lobes inflexed. 



7. C. indecbra Chois. Stems coarse ; flowers fleshy and more or less papillose, 

 3-5 mm. long ; calyx-lobes triangular, acute or acutish ; lobes of the broadly 

 campanulate corolla ovate-lanceolate, minutely crenulate, spreading ; scales 

 large, deeply fringed ; capsule enveloped by remains of corolla ; anthers and 

 stigmas yellow or deep purple. (O. decora Engelm.) Wet prairies, on herbs 

 and low shrubs (principally Leguminosae and Compositae}, from 111. to Fla., 

 Tex., and westw. June-Sept. (Trop. Am.) 



8. C. C6ryli Engelm. Similar to the preceding ; flowers of the same struc- 

 ture, but smaller (2 mm. long), generally 4-merous; corolla deeper, with erect 

 lobes, finally capping the capsule ; scales reduced to a few teeth. ( C. inflexa 

 Engelm.) Open woods and dry prairies, 'on shrubs (hazels, etc.) or coarse 

 herbs, Ct. (according to Britton) ; Va. to Minn. , Neb. , and south w. 



i- -<- Corolla-lobes obtuse, spreading. 



9. C. Gronbvii Willd. Stems coarse, often climbing high ; corolla-lobes 

 shorter than or equaling the deeply campanulate tube ; scales copiously fringed ; 

 capsule globose, umbonate. Wet shady places, N. S. to Man., and southw. 



