576 FLORA. 



Acaulescent; flowers white, pink or rose-purple. 



Scape i-flowered ; flower pink, rarely white ; capsule subglobose. i. O. Acetosella. 

 Scape several-flowered ; flowers rose-purple, or rarely white ; capsule ovoid. 



2. O. violacea. 

 Caulescent ; flowers yellow. 



Cymes umbel-like; pedicels reflexed or deflexed at maturity. 

 Pedicels pubescent with appressed hairs. 



Stems or branches creeping; introduced species. 3. O. corniculata. 



Stems erect, or if decumbent, not creeping; native species. 



Stems pubescent with appressed hairs. 4. O. stricta. 



Stems pubescent with spreading hairs or glabrous. 



Cymes maturing several or all the flowers at about the same time, 

 not accompanied by drooping buds. 

 Leaflets, or most of them, less than 1 cm. wide; stems copi- 

 ously leafy. 5. O.filipes. 

 Leaflets, or most of them, over 1 cm. wide ; stems sparingly 

 leafy. 6. O. Brittoniae. 

 Cymes maturing 1 or 2 flowers at a time, these accompanied by 

 several drooping buds. 7. O. Bushii. 

 Pedicels pubescent with spreading hairs. 



Foliage, especially the leaves, bright green. 



Styles recurved ; petals not ciliate. 8. O. recurva. 



Styles erect ; petals ciliate. 9. O. Priceae. 



Foliage, especially the leaves, reddish purple. 10. O. rufa. 



Cymes dichotomous ; pedicels erect or spreading. 



Leaflets not discolored, green or reddish purple; petals 8-10 mm. long. 

 Foliage, especially the leaves, reddish purple; stems often glabrous. 



10. O. rufa. 

 Foliage, especially the leaves, green; stems pubescent. 



Pedicels pubescent with appressed hairs. 6. O. Brittoniae. 



Pedicels pubescent with spreading hairs. 11. O. cytnosa. 



Leaflets discolored, the margins brownish ; petals 12-16 mm. long. 



12. O. grandis. 



1. Oxalis Acetosella L. White or True Wood-sorrel. Alleluia. (I. 

 F. f. 2250. ) Rootstock scaly, elongated. Foliage pubescent with scattered brown- 

 ish hairs; petioles jointed and dilated at the base; leaflets obcordate, wider than 

 long; scapes 5-15 cm. high; flowers broadly campanulate, about 1.25 cm. long; 

 sepals obtusish; petals veined with deep pink, 3-4 times as long as the calyx; cap- 

 sule subglobose, 2-4 mm. in diameter, glabrous; seeds ovoid, longitudinally 

 grooved. In cold damp woods, N. S. to Manitoba, the mountains of N. Car. and 

 the shore of Lake Superior. Also in Europe, Asia, and N. Africa. Cleistogene 

 flowers are borne on recurved scapes at the base of the plant. May-July. 



2. Oxalis violacea L. Violet Wood-sorrel. (I. F. f. 2251.) Bulb brown- 

 ish, with ciliate scales. Foliage nearly or quite glabrous; leaves about 2.5-3 cm. 

 wide; leaflets obcordate, minutely reticulated, the midrib sometimes sparingly 

 hairy; scapes 1-3 dm. high; pedicels slender; flowers 1.6-2 cm. long, heterog- 

 enous; sepals obtuse; petals lighter toward the base, obtuse or truncate, 3 times as 

 long as the sepals; capsule ovoid, 4 mm. long; seeds flattened, rugose-tuberculate. 

 In woods, northern N. Eng. to Minn, and the Rocky Mts., south to Fla. and N. 

 Mux. Also apparently the same plant in the Andes of Bolivia. May-June. 



3. Oxalis corniculata L. Yellow Procumbent Wood-sorrel. (I. F. f. 

 2252.) Pubescent with appressed hairs or nearly glabrous, deep green, freely 

 branching from the base; stem 2.5-3.5 cm. long, the branches diffuse, mainly pro- 

 cumbent and often creeping. Leaflets about 8-12 mm. wide; petioles dilated at 

 the base into oblong rounded or truncate stipules; peduncles 1-3-flowered; flowers 

 5-lomm. wide; pedicels strigillose, more or less reflexed; capsule oblong, I— 1. 5 cm. 

 Long; appr< ds compressed, transversely ridged. In ballast 

 about tin- Eastern seaports, and frequently growing on the ground in greenhouses. 

 Tex. and throughout tropical Am. Recently found in Ont. Occurs also in warm 

 and tropical regions of the Old World. Feb. -Nov. 



4. Oxalis stricta L. Upright Yellow Wood-sorrel. (I. F. f. 2254.) 



Foliage pale green. Stem commonly branched at the base, the branches spread- 

 ing. 1-3 dm. long; leaves [.8-3.7 cm. broad: leaflets coarsely cellular, sensitive, 

 drooping when touched; petiole! wly dilated; flowers fragrant; peduncles 



