ORDER XXIX. OXALIDACE^E WOOD-SORREL-FAMILY. ORDER XXXV. ANACARDIACEJE SUMACH-FAMILY. 145 



4. P. peltatum. 



Ivy-leaved Geranium. 



Stem long, climbing ; leaves 5-lobed, with the lobes entire, fleshy, smooth, 

 nearly or quite peltate ; flowers handsome, of a purplish tinge, in few-flowered 

 umbels. 



5. P. grandiflorum. Large-flowered Geranium. 



Smooth, glaucous ; leaves 5-lobed, palmate, cordate at base, the lobes 

 toothed toward the summit ; flowers large, white ; petals 3 times as long as the 

 calyx. A beautiful species. 



6. P. grave olens. Hose Geranium. 



Leaves palmate, 7-lobed, the lobes oblong, bluntly toothed, with scabrous and 

 serrulate margins; flowers purple, in many-flowered and capitate umbels. 

 Valued especially on account of the fine fragrance of its leaves. 



7. P. quercifolium. Oak-leaf Geranium. 



Leaves cordate, pinnatifld, with rounded sinuses; the rough, often spotted 

 lobes obtusely crenate ; branches and petioles hispid ; flowers purple. 



ORDER XXIX. 



Oxalidaceae. Wood-sorrel 

 family. 



OXALIS. 



i. 



Sepals 5, distinct or united at base. Petals 5, much longer 

 than the calyx. Capsule oblong, or subglobose. Carpels 5, with 

 1-several seeds. Per. 



1. 0. stricta. Wood-sorrel. 



Stem erect, branching or simple, smooth, leafy ; leaves trifoliate, on long 

 petioles ; leaflets obcordate, smooth ; flowers yellow ; peduncles bearing um- 

 bels of 2 6 flowers, longer than the petioles, axillary ; capsules somewhat hir- 

 sute, leaves acid to the taste. Varies in height from 8' 6'. Fields; common; 

 flowering all summer. 



ORDER XXX. Balsammacese. Balsamitie- 

 family. 



1. IMPlTIENS. 



Sepals 5, colored, apparently 4, from the union of the 2 upper 

 ones ; lowest gibbous and spurred. Petals 4, apparently 2, from 

 the fact of the lower ones being united to each of the lateral 

 ones. Stamens with anthers cohering at the apex Capsule often 

 1-celled, from the disappearance of the dissepiments, 5-valved, 

 bursting elastically. An. 



1. I. fiilva. 



Jewel-weed. 



Stem smooth, branching, succulent ; leaves rhombic-ovate, rather obtuse, 

 coarsely and obtusely serrate, with mucronate teeth, petiolate ; flowers large, 

 deep orange, spotted with brown dots, very irregular in form ; peduncles 2 4- 

 flowered ; lower sepal acutely conical ; spur longer than the petals, recurved. 

 A very succulent and somewhat glaucous plant, 1 8 feet high, with handsome 

 flowers, in wet grounds. Capsule bursting elastically, and scattering the seeds. 

 June Sep. 



2. I. balsamina. Balsamine. Touch-me-not. 



Btem erect, succulent, branching ; leaves lanceolate, serrate, lower ones op- 

 posite, upper alternate ; pedicels clustered ; flowers large, in axillary clusters, 

 shorter than the leaves ; spur shorter than the flower. A very common and ex- 

 ceedingly beautiful annual. 



ORDER XXXII. Tropoeolacese. Nasturtium 

 family. 



1. TROPC&OLUM. 



1. T. majus. Nasturtium. 



Leaves peltate, orbicular, repand on the margin ; petioles long, inserted a 

 little out of the centre of the leaf; flowers large, brilliant orange-colored, with 

 darker spots ; petals obtuse; the 2 upper distant from the 8 lower, which are 

 fltnbriate at base with long, narrow claws. A long trailing plant, climbing by 

 Its petioles. June Nov. An. 



19 



ORDER XXXIII. Eutacese. Rue-family. 



1. RtTTA. 



Sepals 4 5, united at base. Petals 4 5, concave, obovate, 

 distinct Torus surrounded by 10 nectariferous pores. Stamens 

 10. Capsule lobed. Per. 



1. R. graveolens. Sue. 



Nearly smooth, snffruticose ; leaves bi- and triplnnately divided ; segments 

 oblong, obtuse, terminal ones wedge-obovate ; all entire, or incised, punctate with 

 conspicuous dots ; flowers yellow, terminal, corymbose; petals entire. A gar- 

 den plant growing 8 1 ft. high. 



ORDER XXXIV. Zanthoxylacese. Prickly 



Ash-tribe. 



1. ZANTH6XYLUM. 



Polyygamous. Perfect flowers Sepals 5. Petals none. Sta- 

 mens 3 6. Pistils 3 5. Carpels 3 5, 1-seeded. Fertile flowers 

 same as the perfect, only wanting the stamens, and the barren, 

 also, are the same, wanting only the pistils. 



1. Z. Americanum. Prickly Ash,. 



Branches and petioles armed with stout, hooked prickles ; leaves pinnate . 

 leaflets 5 7, ovate, mostly entire, sessile, more or less pubescent, especially 

 beneath ; flowers small, greenish, in axillary umbels, appearing just before the 

 leaves ; perfect and staminate flowers growing on the same tree ; pistillate on a 

 different one. Bark bitter, aromatic, used in medicine for toothache and rheu- 

 matism. Woods; not very common; sometimes cultivated. An. 



2. AILANTHUS. 



Polygamous. Sepals 5, more or less united at base. Petals 

 5. Stamens of the perfect flowers 2 3. Ovaries 3 5. Fruit a 

 1-celled, 1-seeded samara, with an oblong border. Stamens of 

 the barren flowers 10. Fertile flowers same as the barren, ex- 

 cept the stamens. 



1. A. glandulosa. Ailanthus-tree. 



Leaves smooth, unequally pinnate ; leaflets ovate or oblong-lanceolate, acu- 

 minate, very shortly potiolate, with 1 or 2 obtuse, glandular teeth each side 

 at base, terminal one with a long petiole ; flowers greenish, in terminal panicles, 

 of an Intolerably offensive odor. A large, rapid-growing tree, with luxuriant 

 foliage. The leaves are often from 29 feet long, with 10 20 pairs of leaflets 

 of an offensive, sickening odor. Young branches light brown, smooth. Com- 

 mon in cultivation. June. 



ORDER XXXV. Anacardiacese. Sumach- 

 family. 



1. RHtfS. 



Sepals 5, united at base. Petals 5. Stamens 6. Styles 3. 

 Stigmas capitate. Fruit a dry drupe, containing a single, bony, 

 1-celled nut. Flowers by abortion often dioecious. 



1. R. glabra. Sumach. 



Young branches smooth ; leaves pinnate, 6 15-foliate ; leaflets lance-oblong, 

 acuminate, smooth, paler beneath, sessile, sharply serrate ; flowers small, greeu- 

 ish, in dense, terminal, thyrsoid panicles, followed by small drupes covered 

 with crimson hairs, of a sour taste. A shrub 6 10 feet high, in pastures and 

 thickets, of an irregular straggling growth, and very pithy, brittle stems. June 

 July. 



2. R. typhina. Stag-horn Sumach. 



Young branches and petioles densely villous ; leaflets 1881 oblong-lanceo- 

 late, obtuse at base, acuminate, sharply serrate, pubescent beneath, especially 

 the mid-vein ; flowers yellowish green, In dense thyrsoid, terminal panicles ; 

 drupes compressed, densely covered with acid, crimson hairs. A shrub resem- 

 bling the last in Its mode of growth, but larger, 10 20 feet high, distinguished 

 by its exceedingly villous branchlets. Wood sulphur-yellow, of an aromatic 

 odor. Rocky, barren fields. June. 



3. R. copallina. Mountain Sumach. 



Branches and petioles pubescent; leaflets 9 21, oval-lanceolate, acute, or 

 acuminate, nearly entire, shining above, pubescent beneath, oblique at base ; 



