78 FAM. 98. 



fruit a 5-celled capsule. - Xanthoxalis (Oxalis), Yellow Sour-Grass 

 X. macrantha. Erect or decumbent, strigillose; sepals copiously ciliate all around; 



petals golden yellow. Riverbanks. Spring to Fall. 

 X. stricta. Often decumbent, strigillose; sepals sparingly ciliate; petals pale 



yellow. Roadsides. Spring to Fall. 

 X. recurva. Tufted, villous; cymes umbel-like; sepals ciliate all around; petals 



golden yellow. Dry soil. Spring and Summer. 

 Cultivated species are Oxalis rosea, rose-colored, and O. versicolor, white bor- 

 dered with red, yellowish below. 



98. Rutaceae, Rue Family. 



Shrubs or trees often armed with prickles; leaves ex- 

 stipulate, alternate or opposite, simple or pinnately com- 

 pound, dotted; flowers mostly regular in cymes, panicu- 

 late or corymbose; sepals 3-5, more or less united at the 

 base, or wanting; petals 3-5 or more; stamens as many 

 to thrice as many as the petals, or more, inserted on a 

 hypogynous disk, distinct or united below; ovaries 2-5, 

 distinct or united; styles more or less united; stigma often 

 3-5 angled; fruit capsular or a samara, drupe or berry. 



1. Fruit a dry dehiscent capsule; seed solitary; — leaves alternate, odd- 

 pinnate; sepals, petals and stamens 4-5. ----- Fagara 

 F. Clava-Herculis (Zanthoxylum Carolinianum), Toothache tree, Sea-ash, 

 Prickly ash, Pepper-wood. A prickly shrub or tree, leaflets 7-11, flowers 

 greenish to white. Dry soil near the coast. 

 1. Fruit a berry; seeds several in each cavity; — cultivated and natural- 

 ized shrubs and trees more or less armed; leaves mostly simple, 

 leathery, often with a winged petiole; flowers regular, axillary; 

 calyx cup-like; petals 5, rarely 4-8, white, at least inside, deci- 

 duous; stamens 20-60; ovary several-celled, superior; styles 

 united, deciduous; berries with a bitter oily rind, Citrus 



a. Leaves trifoliate, deciduous; — leaflets elliptical, dentate or cre- 



nate; flowers before the leaves, white, - - - C. trifoliata (triptera) 



a. Leaves unifoliate, evergreen, ________b 



b. Petioles wingless and marginless; leaves oblong, senate or cre- 



nate; flowers mostly purplish outside; fruit large, mostly 

 ovate-oblong, with a very thick tender rind and but slightly 

 developed pulp, ___-__- C. Medica Citron* 



b. Petioles with wings or margins, ------- -c 



c. Wings broad or narrow, ----- -__ - d 



c. Wings very narrow or mere margins, ------ -e 



d. Leaves elliptical or ovate, acute, obtuse or acuminate; flowers 



white. (The Otaheita Orange with pinkish flowers is culti- 

 vated as a dwarf potplant). C. aurantium, Or ange 

 Var. amara (C. Bigaradia), Sour, Biiler or Seville Orange. Petiole broad- 

 ly wing-margined; — leaves ovate, pointed; flowers sweet-scented; fruit 

 round, dark orange; pulp sour and bitter. 



* A form of Watermelon is also called "Citron." 



