350. Ajuga. - Calyx ovate, bell-shaped, 5-cleft; corolla with short upper lip, entire or notched.

Order 60. Plantaginaceae

351. Plantago. - Plant terrestrial; flowers bisexual; calyx 4-cleft; corolla-tube ovoid, 4-partite; stamens epipetalous; capsule opening transversely.

352. Littorella. - Plant aquatic; monoecious; male flowers stalked; sepals 4; corolla-tube cylindrical; limb 4-partite; stamens hypogynous; female flowers sessile; sepals 3; style long; capsule 1-seeded.

Order 61. Illecebraceae

353. Illecebrum. - Leaves opposite; sepals white, concave, long-pointed; no petals or small scales.

354. Herniaria. - Leaves opposite, not united below; sepals green, blunt; petals slender; stigmas 2; no style.

355. Corrigiola. - Leaves alternate; petals 5, as long as sepals, oblong; stigmas 3.

356. Scleranthus. - Leaves opposite, filiform, united below; sepals and petals 5; stamens 10; stigmas 2.

Order 62. Amaranthaceae

357. Amaranthus. - Plant monoecious; perianth 3-5-partite; stamens 3-5; stigmas 3; capsule 1-celled, 1-seeded.

Order 63. Chenopodiaceae

358. Chenopodium. - Flowers bisexual; no bracts; perianth 3-5-partite; stamens 5; stigmas 2-3; utricle membranous; pericarp free; testa crustaceous.

359. Beta. - Perianth 5-partite; stamens 5; styles 2-3; utricle striate, hard above; pericarp adhering to perianth; testa thin.

360. Atriplex (and Obione). - Plant monoecious; stem leafy; male flowers 3-5 sepals; stamens 5; style o; female 2 sepals; perianth flattened; stamens o; stigmas 2; pericarp membranous; testa crustaceous.

361. Salicornia. - Flowers bisexual; stem leafless, jointed; perianth fleshy; stamens 1-2; style short; stigma 2-fid; pericarp membranous.

362. Suaeda (Dondia) (Lerchia). - Stem leafy; leaves not spinous, 1/2-cylindrical; perianth 5-partite; not appendaged; stamens 5; stigmas 2-3; pericarp membranous; testa crustaceous.

363. Salsola. - Stem leafy; leaves spinous; perianth 5-partite, segments appendaged, transversely winged in fruit; stamens 5; styles 2; pericarp membranous.

Order 64. Polygonaceae

364. Polygonum. - Flowers in raceme; perianth 5-partite, segments sub-equal; stamens 5-8; styles 2-3; fruit compressed, 3-angled, wingless.

365. Fagopyrum. - Flowers cymose; perianth 5-partite; stamens 8; styles 3; nut 3-angled; cotyledons large, leafy, twisted plicate.

366. Rumex. - Perianth 6-partite, 3 inner segments longer; stamens 6, in pairs; styles 3; fruit 3-angled.

367. Oxyria. - Perianth 4-partite, 2 inner segments large; stamens 6; stigmas 2, multifid; nut flattened, winged.

Order 65. Aristolochiaceae

368. Asarum. - Herbaceous; perianth bell-shaped, 3-cleft; stamens 12; stigma 6-lobed; capsule 6.celled.

369. Aristolochia. - Stem erect; perianth tubular, swollen below, mouth oblique; stamens 6; style columnar; stigma 6-lobed; capsule 6-celled.

Order 66. Thymelaeaceae

370. Daphne. - Shrub, perianth 4-partite, deciduous; stamens 8, in 2 rows; fruit a berry, fleshy, 1-seeded.

Order 67. Elaeagnaceae

371. Hippophae. - Shrub, spinose; plant dioecious; male flowers in catkin, scales ovate, perianth of 2 leaves; stamens 4; female flowers solitary; perianth tubular; style short; nut 1-seeded.

Order 68. Loranthaceae

372. Viscum. - Hemi-parasite, on trees, yellowish-green; plant dioecious; perianth fleshy, 4-partite; anthers opening by pores; stigma sessile; berry I-seeded, white.

Order 69. Santalaceae

373. Thesium. - Hemi-parasite on roots, green; plant prostrate; leaves linear; perianth 4-5-cleft funnel-shaped; stamens 5; style 1; nut drupe-like.

Order 70. Euphorbiaceae

374. Euphorbia. - Plant monoecious; stem with milky juice; involucre calyciform, several male flowers (monandrous) surrounding 1 female.

375. Buxus. - Shrub, evergreen, glossy; plant monoecious; male perianth 3-partite, inner segments 2; stamens 4; female perianth 4-partite, inner segments 3; capsule 3-celled.

376. Mercurialis. - Plant monoecious or dioecious; perianth 3-partite; 9-16 stamens in male, 2 barren filaments in female flowers; style forked; capsule 2-celled.

Order 71. Ulmaceae

377. Ulmus. - Tree, deciduous; perianth 4-5-partite; stamens 5; styles 2; capsule winged.

Order 72. Urticaceae (and Cannabinaceae)

378. Humulus. - Twining plant; plant dioecious; female flowers in catkins, paired; perianth of male 5-partite, of female scale-like; ovary I-celled.

379. Cannabis. - Plant herbaceous, dioecious; flowers in racemes; stamens 5; perianth 5-partite; female perigonium 1-leaved.

380. Urtica. - Leaves opposite, with stinging hairs; plant herbaceous, monoecious or dioecious; male perianth 4-partite; stamens 4; female perianth 2-partite; flowers in racemes.

381. Parietaria. - Leaves alternate, hairs simple; flowers polygamous, in axillary clusters; perianth bell-shaped, 4-partite; stamens 4; style slender.

Order 73. Myricaceae

382. Myrica. - Shrub, aromatic; perianth o; plant monoecious or dioecious; flowers in catkins with concave scales; fruit drupe-like, I-celled; stamens 4-8.

Order 74. Amentaceae

383. Betula. - Tree, deciduous; plant monoecious; flowers in catkins; scales of female catkins thin, deciduous, 3-fid; stamens 2; perianth o; fruit with membranous margin.

384. Alnus. - Tree, deciduous; stamens 4; female catkin small, ovoid; scales persistent, woody; fruit not winged.

385. Carpinus. - Involucre leafy, 3-lobed; female spike large, with many leafy scales; stigmas 2; scales of male catkin 3-cleft.

386. Corylus. - Tree or shrub'; scale of male catkins round; involucre leafy; anthers I-celled; stigmas 2, red.

387. Quercus. - Tree, deciduous; male catkins slender; stigmas 3; involucre a cupule, entire; not spiny or leafy; nut (acorn) I-seeded.

388. Castanea. - Stamens 8-20; involucre muri-cate, 4-lobed; stigmas 5-8; nut 1-3-seeded.

389. Fagus. - Male flowers in globose catkin; stigmas 3; involucre prickly, entirely enclosing 3-angled nut (mast).

Order 75. Salicaceae

390. Salix. - Tree, deciduous; plant dioecious; leaves usually narrow; catkins generally erect with overlapping entire scales; perianth o; stamens 1-5; fruit a I-celled nut.

391. Populus. - Tree, deciduous; plant dioecious, leaves broad; catkins drooping with slashed scales; perianth cup-shaped; stamens 4-30; fruit nearly 2-celled.

Order 76. Empetraceae

392. Empetrum. - Heath-like low shrub; calyx 3-partite; petals 3-partite; stamens 3; drupe black.

Order 77. Ceratophyllaceae

393. Ceratophyllum. - Aquatic; plant monoecious; leaves forked, whorled, linear, spinose; anthers 12-20, sessile; perianth o; ovary I-celled; stigma unilateral.