GERANIUM FAMILY 533 



3-toothed at the apex; pedicels retrorsely pubescent; sepals awn-tipped, 8-9.5 

 mm. long, elliptic-lanceolate, minutely pubescent; petals light pink or rose- 

 colored, 12-15 mm. long; style-column 15-18 mm. long, minutely hirsute; car- 

 pels sparingly pubescent. Mountain plateaus : Utah. Mont. Au. 



19. G. atropurpureum Heller. Stems tufted, spreading, 1-9 dm. long, 

 retrorsely pubescent; leaf -blades thick, 3-5-parted, strigillose-pubescent , 2-5 

 cm. wide, the lower reniform, the upper pentagonal in outline; divisions incised 

 or coarsely toothed; pedicels retrorsely pubescent, not glandular; sepals awn- 

 tipped, 10-11.5 mm. long, oblong, finely pubescent and ciliate; petals purple, 

 12-15 mm. long, oblong or narrowly obovate, not notched; style-column 19-23 

 mm. long, minutely pubescent; carpels pilose. G. gracile Engelm., not Ledeb. 

 Plains and hills: Colo. — Utah — N.M. — n Mex. Submont. Je-S. 



2. ERODIUM L'Her. Storkbill, Alfilari.\, Pin Clover, Filaree. 



Annual or perennial herbs, with opposite leaves. Leaf -blades pinnately 

 divided or lobed, or if merely toothed, pinnately veined, long-petioled. Sepals 

 5, usually awn-tipped. Petals 5, those of the later flowers often reduced. Sta- 

 mens 5, alternating with 5 staminodia. Style-column very elongate, the styles 

 pubescent within, and spirally coiled, when freed from the central axis. Carpels 

 narrow, spindle-shaped. Seeds smooth. 



1. E. cicutarium (L.) L'Her. An annual, with low spreading stem; leaf- 

 blades pinnately divided; segments oblong to ovate, pinnatifid or incised; ped- 

 uncles and pedicels more or less hirsute, rarely glandular, sepals oblong, 6-7 mm. 

 long, the short tips with 1 or 2 bristle- hke appendages; petals shghtly longer than 

 the sepals, pink, with darker veins; anther-bearing filaments toothless; style- 

 colimin 3^ cm. long. Waste places and fields: N.S. — N.J. — N.M. — Calif. — 

 B.C. — Alta. ; Mex. and C. Am.; nat. from Eu. Plain — Submont. My-Au. 



Family 67. OXALIDACEAE. Wood-sorrel Family. 



Mostly herbs, with elongate or bulb-like rootstocks. Leaves alternate, 

 sometimes all basal, compound, in ours palmately trifoliolate. Flowers 

 perfect, regular or nearly so, cymose. Sepals and petals 5. Stamens 10, 

 in 2 series, monadelphous. Gynoecium of 5 united carpels; styles distinct 

 or coherent. Fruit a valvate capsule. 



Acaiilescent herbs, with bulb-like rootstocks; petals violet or purple. 1. Ionoxalis. 

 Caulescent plants, with slender horizontal rootstocks or with an annual taproot; petals 

 yellow. 2. Xanthoxalis. 



1. IONOXALIS Small. Violet Wood-sorrel. 



Perennial succulent herbs, with scaly bulbs, scapose. Leaves basal, with 

 elongate petioles; blades palmately 3-9-foliolate. Flowers in umbel-like 

 cymes, subtended by several bracts. Sepals 5, each with one or two pairs of 

 apical tubercles. Petals 5, violet, blue, red, or white. Stamens 10; filaments 

 united at the base, the longer sometimes appendaged on the back. Capsules 

 erect. 



1. I. violacea (L.) Small. Plant 1-4 dm. high; bulb-scales 3-ribbed; petioles 

 glabrous; leaflets 3, obreniform, 1-2.5 cm. broad, glabrous, bright green above, 

 shghtly paler beneath; scape and pedicels glabrous, the former 4-19-flowered; 

 sepals oblong to ovate-oblong, 4-6 mm. long, glabrous; petals violet, 14-20 mm. 

 long; filaments pubescent; capsule globose-ovoid, 4-5 mm. long. Oxalis violacea 

 L. Rich soil: Me. — Fla. — Tex. — Colo. Plain — Submont. Ap-S. 



2. XANTHOXALIS Small. Yellow Wood-sorrel. 



Herbs, perennial, with horizontal rootstocks or annual taproots, or rarely 

 shrubs. Stem leafy. Leaves alternate, sometimes clustered at the nodes. 

 Leaves palmately 3-foUolate; leaflets mostly obcordate (in our species), or rarely 

 broadest at the base, sessile. Flowers in umbel-like or dichotomous cymes. 

 Sepals 5, herbaceous or petaloid. Petals 5, yellow or purplish, deciduous. 



