302 GERANIACEAE (GERANIUM FAMILY) 



narrowly oblong to linear, acute, 2.5-5 cm. long; stipules mostly narrow, often 

 small: peduncles 2-6-flowered; flowers purple, 12 mm. long. Colorado and 

 southward. 



5. Lathyrus leucanthus Rydb. Bull. Torr. Bot. Club 28: 37. 1901. Nearly 

 glabrous, 2-3 dm. high; stem angled: stipules very narrow, semisagittate; 

 leaflets 2-4 pairs, elliptic or narrower, veiny; tendrils of the lower leaves short 

 or wanting; of the upper elongated and 2-3-divided: racemes 2-4-flowered : 

 calyx glabrous, cleft to the middle: corolla white or yellowish, about 15 mm. 

 long; the banner broad. L. palustris and L. myrtillifolius as to the plants of 

 our range. Colorado to Utah and Nevada. 



6. Lathyrus ochroleucus Hook. Fl. Bor. Am. 1: 159. 1833. Glabrous or 

 subglaucous; stems slender, climbing or scrambling: stipules broad, foliaceous, 

 semicordate, half as large as the thin ovate leaflets: peduncles 7-10-flowered; 

 flowers 12-20 mm. long, yellowish-white: pod sessile, glabrous, 3-4 cm. long. 

 Coming into the northeastern part of our range; extending far northward and 

 eastward. 



7. Lathyrus utahensis Jones, Proc. Cal. Acad. 5: 678. 1895. Leaflets 

 4-6 pairs, oval or ovate, 2-4 cm. long, obtuse at both ends, apiculate at apex, 

 prominently veined: stipules large, reniform, variously cut: peduncles about 

 equaling the leaves, 4-6-fl owered ; flowers 15-20 mm. long, white or ochroleu- 

 cous, sometimes tinged with purple: calyx-lobes subulate-triangular: pod 

 4-5 cm. long, smooth as is the rest of the plant. Colorado and Utah. 



58. GERANIACEAE St. Hil. GERANIUM FAMILY 



Herbs, with alternate or opposite lobed or dissected leaves, and complete, 

 regular, symmetrical 5-merous flowers. Sepals persistent. Petals deciduous. 

 Stamens same number as petals or 2-3 times as many; filaments distinct; 

 anthers versatile. Pistil of 5 united carpels, the styles united into a column. 

 Fruit a 5-celled capsule. 



Stamens 10; carpel-tails naked on the inner side . . . . . . 1. Geranium. 



Stamens 5; carpel-tails hairy on the inner side ...... 2. Erodium. 



GERANIUM L. GERANIUM OR CRANESBILL 



Annual or perennial herbs, often glandular-pubescent, usually with deeply 

 lobed or dissected leaves with conspicuous stipules. Petals imbricated, alter- 

 nating with 5 glands. Stamens usually 10, 5 of them longer and alternating 

 with the 5 shorter ones. Capsule 5-lobed, each lobe separating elastically 

 at the base at maturity, curling upward and back upon the united styles; the 

 cavities 1 -seeded. 



Annual or biennial; adventive. 



Stamens 5; seeds smooth . . . . . . . 1. G. pusillum. 



Stamens 10; seeds reticulated . . . . . . . 2. G. carolinianum. 



Perennial; indigenous. 



No glandular pubescence . . . . . . . . 3. G. caespitosum. - 



More or less glandular-pubescent. 



Leaves and flowers large; petals (within) and filaments more or 



less long-villous. 

 Plants single or scarcely tufted. 



Pubescence tipped with purple glands . . . . 4. G. Richardsonii. 



Pubescence viscid-glandular . . . . . . 5. G. viscosissimum. 



Plants caespitose-tufted. 



Pubescence short-glandular, mostly above only . . 6. G. Fremontii. 

 Pubescence viscid-villous as well as short-glandular . 7. G. Parryi. 



Leaves and flowers small; petals and filaments not long- 

 villous . . . . . . . . . . 8. G. longipes. 



1. Geranium pusillum L. Sp. PI. Ed. 2, 957. 1763. Slender, spreading, 

 soft-pubescent on the calyx, etc., somewhat glandular-villous or with short 



