GENUS 3. 



WOOD-SORREL FAMILY 



g. Xanthoxalis cymosa Small. Tall 

 Yellow Wood-sorrel. Fig. 2673. 



Oxalis cymosa Small, Bull. Torr. Club 23 : 267. 



1896. 

 X. cymosa S~nall, Fl. SE. U. S. 668. 1903. 



Plants normally tall, bright green. Stem 

 usually erect, 6'-4 high, branched above, often 

 villous, reddish or brown ; leaves p"-i8" 

 broad, on petioles ii'-3' long; leaflets broader 

 than long, sharply notched ; petiole-bases 

 scarcely dilated; flowers yellow, in dichoto- 

 mpus cymes ; pedicels erect, or ascending, 

 3" -4" long, more or less villous; sepals lan- 

 ceolate or narrowly elliptic, 2 "-3" long, finally 

 spreading; petals obtuse, or emarginate, 4"-s" 

 long; capsule slender, columnar, 5"~7" long, 

 gradually narrowed to the summit; seeds 

 obovoid-oblong, I" long, with nearly continu- 

 ous ridges. 



In woods and fields, Ontario to Michigan, Flor- 

 ida, Nebraska and Texas. May-Oct. 



10. Xanthoxalis grandis Small. Great Yel- 

 low Wood-sorrel. Fig. 2674. 



Oxalis recurva Trel. Mem. Bost. Soc. Nat. Hist. 4 : 89. 



1888. Not Ell. 1821. 



Oxalis grandis Small, Bull. Torr. Club 21 : 474. 1894. 

 Xanthoxalis grandis Small, Fl. SE. U. S. 668. 1903. 



Plants stout, glabrate below or villous, bright 

 green. Stem erect, i-4 tall, simple, or nearly so; 

 leaves ii'-3' broad; leaflets usually unequal, often 

 with a brown margin, more or less ciliate ; petioles 

 villous, hardly dilated at the base, 2'-6' long ; flowers 

 yellow, in dichotomous cymes ; pedicles $"-7" long, 

 erect, or spreading ; sepals unequal ; ovate, or ob- 

 long, 2"-3" long, often ciliate at the apex ; petals 

 rounded at the apex, 6"-8" long; capsule stout, 

 ovoid, or ovoid-oblong, 3"-s" long, seeds ovoid or 

 obovoid, i" long, with broken transverse ridges. 



On river banks, Pennsylvania to Illinois, Georgia and 

 Alabama. May-Aug. 



Family 63. LINACEAE Dumort. Comm. Bot. 61. 1822.* 



FLAX FAMILY. 



Herbs, or shrubs, with alternate or opposite leaves, and perfect regular nearly 

 symmetrical flowers. Stipules mostly small or none. Sepals 5, rarely 4, imbri- 

 cated, persistent. Petals of the same number and alternate with the sepals, imbri- 

 cated, generally contorted. Stamens of the same number, alternate with the 

 petals ; filaments monadelphous at the base ; anthers versatile, 2-celled. Ovary 

 i, 2-5-celled, or by false septa 4-io-celled. Ovules anatropous. Styles 2-5. 

 Fruit mainly capsular. Seeds 1-2 in each cavity, oily ; endosperm little or none ; 

 embryo straight ; cotyledons flat. 



About 14 genera and about 160 species of wide geographic distribution. 



Stigmas introrse and elongated; sepals glandless ; petals mostly blue or red. i. Linum. 



Stigmas terminal and capitate ; sepals, at least the inner ones, with marginal glands ; petals mostly 



yellow. 2. Cathartolinnin. 



i. LINUM [Tourn.] L. Sp. PI. 277. 1753. 



Annual or perennial herbs, sometimes woody at the base, with alternate or opposite, 

 rarely verticillate, sessile leaves, and perfect flowers. Inflorescence axillary or terminal. 

 Stipules or stipular glands wanting. Sepals 5, persistent. Petals 5, blue, red or rarely white, 

 fugacious. Stamens 5, monadelphous, with interspersed staminodia. Ovary 5-celled, or 

 8-io-celled by false partitions, not cartilaginous at the base, t)i<> real cavities 2-ovuled. Capsule 



* Revised by Dr. JOHN K. SMALL. 



