LINNJEAN ARTIFICIAL ARRANGEMENT. Iv 
CLASS IV. TETRANURIA. 
Order Monogynia. Style or sessile stigma 1. 
* Calyx free from the ovary : petals separate or none. 
Smilacina § Maianthemum. Perianth 4-parted, spreading. Flow¬ 
ers racemed. 491 
Orontium. Sepals distinct. Flowers spiked on a scape. 448 
Ammannia. Calyx bell-shaped, 4-toothed. Flowers axillary. , 132 
Sanguisorba. Calyx constricted at the throat, 4-lobed. Flowers in 
close spikes. 118 
# # Calyx free from the ovary. Corolla monopetalous. 
Frasera. Corolla deeply 4-parted, wheel-shaped, gland-bearing. 362 
Bartonia. Corolla deeply 4-cleft, not gland-bearing. Calyx 4-parted. 358 
Obolaria. Corolla 4-cleft. Calyx of 2 leaf-like sepals. 363 
Erythr®a. Corolla tubular, salver-form. Leaves opposite. 357 
Plantago. Corolla salver-form or bell-shaped. Flowers spiked. 
Leaves radical. 278 
* * * Calyx adherent to the ovary or its base. 
-♦-Corolla 4-petalous, or none. 
Cornus. Calyx-limb minute, 4-toothed. Drupe 2-celled, 2-seeded. 167 
Ludwigia. Calyx 4-lobed. Pod 4-celled, many-seeded. 137 
h— i-Corolla monopetalous, 5-lobed. 
Linn® a. Calyx 5-cleft. Flowers in pairs. Stamens unequal. 170 
-♦—i—H-Corolla monopetalous, 4-lobed. 
Diodia. Flowers axillary. Pod separating into 2 pieces, 2-seeded. 178 
Hedyolis. Flowers single or clustered. Pod many-seeded (often 
partly free). 179 
Mitchella. Flowers united in pairs. Berry double. 179 
Cephalanthus. Flowers in a naked head. Pod 2-4-seeded. 179 
Dipsacus. Flowers in an involucrate chaffy head. Fruit 1-seeded. 183 
Order Oigynia. Styles or sessile stigmas 2. 
* Corolla polypetalous. 
Hamamelis. Petals 4, strap-shaped. Pod 2-beaked, crustaceous. 152 
* • Corolla monopetalous. 
Galium. Corolla 4- 3-parted, wheel-shaped. Fruit 2-lobed, 2-seeded. 176 
Cuscuta. Corolla bell-shaped. Pod 2-celled, 2-4-seeded, 350 
Gentiana. Corolla funnel-form, spurless. Pod l-cell$d, many-seeded. 358 
Halenia. Corolla 4-spurred below. * 361 
Order Tri-Pentagynia. Styles or sessile stigmas 3-5. 
* Pistils separate, free from the calyx. 
Ruppia. Calyx and corolla none. (Stamens really but 2.) 454 
Potamogeton. Calyx 4-sepalled. Petals none. Fruit 4 nutlets. 454 
Alchemilla. Calyx 4-cleft. Petals none. Styles lateral. 118 
Till.®a. Sepals, petals, and several-seeded pods 3-4. 146 
* * Pistils combined into one, free from the calyx. 
Sagina. Pod l-celled, several-seeded, 4-5-valved- 63 
Ilex. Drupe berry-like, 4-celled, 4-seeded. Calyx minute. 275 
CLASS V. PENT ANURIA. 
Order Monogynia. Style or stigma 1. 
* Petals separate or none. 
-♦-Herbs : calyx free : petals none. 
Su®da. Calyx succulent. Stigmas 2-5. Utricle l-seeded. 377 
