I) 7 '2 CONVOLVULAOKAi: (CONVOL.VCJLC8 FAMILY) 



persistent around the capsule; sdnm-iis included; scales short, broad, erenu- 

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

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

 (In trod, from Eu.) 



2. C. EpfTiiYAirM Murr. Steins 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. EUROPA^A 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, ete, 

 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; flowers white, 2-3 mm. 



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., and southw.; often on Polygonum. July-Sept. 

 (Trop. Am., Eurasia.) 



5. C. arv6nsis Beyrich. Stems pale and slender, low ; flower* 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 friinj<-<L 

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



-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. t< -nniflnra 

 Kngelm.) On tall herbs and shrubs, Pa. to Minn., and southw. 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. indec6ra 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, *j>n <t<l//i</ ; .svoVrs 

 large, deeply fringed; c<t]>sule em-eloped />>/ remain* of corolla ; anthers and 

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

 and low shrubs (principally Li'ijnniiiimn- and Compositae}, from 111. to Fla.. 

 Tex., and \vestw. June-Sept. (Trop. Am.) 



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

 ture, but. siiHilliT c2 nun. long), generally 4-merous ; corolla deeper, ?///// erect 

 loin N. fntitlhj c/fftju'in/ the capsule ; scales reduced to a feir (eetti. (C 1 . ltijl.rn 

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

 herbs, Ct. (according to Brit ton); Va. to Minn., Neb., and southw. 



H- -- Corolla-lobes obtuse, spreading. 



( .i. C. Gronbvii Willd. Stems coarse, often climbing liiuh ; corolla-lobes 



shorter than or equaling the deeply eainpanulate tube ; scales copiously t'rinued ; 

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



