VOL. II.] 



HEATH FAMILY. 



563 



7. CHAMAECISTUS OEder, Fl. Dan. pi. 9. 1761. 

 [LoiSELEURiA Desv. Journ. Bot. (II) i: 35. 1813.] 



A low glabrous depressed straggling branched shrub, with small linear-oblong petioled 

 obtuse entire coriaceous and evergreen leaves, and small solitary or few flowers on terminal 

 erect pedicels. Calyx 5-parted, the segments ovate-lanceolate, persistent. Corolla broadly 

 campanulate, with 5 obtuse imbricated lobes. Stamens 5, included; filaments slender, adnate 

 to the corolla; anthers globose-didymous, dorsally attached to the filaments, longitudinally 

 dehiscent. Disk obscurely 5-lobed. Ovary globose, 2-3 -celled; style short, straight; stigma 

 capitate; ovules numerous. Capsule subglobose, 2-3 -celled, septicidally 2-3-valved, the 

 valves 2-cleft. Seeds ovoid, the testa granular. [Greek, ground cistus-] 



A monotypic genus of the colder parts of the northern hemisphere. 



i. Chamaecistus procumbens (I,.) Kuntze. 

 Alpine or Trailing Azalea. (Fig. 2755.) 



Azalea procumbens L. Sp. PI. 151. 1753- 

 Loiseleuria procumbens Desv. Journ. Bot. (II) i: 35. 1813. 

 C. serpyllifolia S. F. Gray, Bot. Arr. Brit. PI. a: 401. 1821. 

 Chamaecistus procumbens Kuntze, Rev. Gen. PI. 388. 1891. 

 Tufted, much branched, diffuse, branches 2 / -4 / long. 

 Leaves mostly opposite, rather crowded, dark green 

 above, paler beneath, 2 // -4 // long, the midrib very promi- 

 nent on the lower side, the margins strongly revolute; 

 petioles W long or less; flowers 1-5 from terminal coria- 

 ceous buds; pedicels 3 // -4 // long; corolla pink or white, 

 about 2" high, longer than the purplish sepals; capsule 

 about i" in diameter. 



Summits of the White Mountains, N. H.; Mt. Albert, 

 Quebec; Labrador to arctic America and Alaska. Also in 

 northern Europe and Asia. July-Aug. 



8. KALMIA L. Sp. PI. 391. 1753. 



Erect branching shrubs, with entire evergreen coriaceous leaves, alternate, opposite, or 

 verticillate in 3's. Flowers in umbels or corymbs, or solitary, or 2-3 together in the axils. 

 Calyx 5-parted or 5-divided, the segments imbricated in the bud. Corolla saucer-shaped, 

 the limb strongly ic-keeled in the bud, 5-lobed, with 10 pouches below the limb, the keels 

 extending from the pouches to the lobes and sinuses. Stamens 10, shorter than the corolla; 

 anthers oblong, awnless, the sacs opening by large terminal pores; filaments erect in the 

 bud, soon curving outward, placing the anthers in the pouches of the corolla, straightening 

 elastically when the flower is fully expanded. Disk io-crenate. Ovary 5-celled; ovules 

 numerous; style slender; stigma depressed-capitellate. Capsule subglobose, obscurely 5- 

 lobed, 5-celled, septicidally 5-valved from the summit. Seeds small, subglobose. [Dedi- 

 cated by Linnaeus to his pupil, Peter Kalm, 1715-1779, who travelled in America.] 



Six known species, 5 of eastern North America, the other Cuban. 

 Flowers in mostly compound umbels or corymbs; twigs terete. 



Leaves oblong, mostly obtuse ; flowers 3" -5" broad. i. K. angustifolia. 



Leaves elliptic or oval, acute at both ends; flowers 8"-i2" broad. 2. K. latifolia. 



Flowers in simple terminal umbels; twigs 2-edged. 3. K. glauca. 



Flowers mostly solitary in the axils; leaves and twigs hirsute. 4. K. hirsuta. 



i. Kalmia angustifolia L. Sheep-laurel. 

 LambkiH. Wicky. (Fig. 2756. ) 



Kalmia angustifolia L. Sp. PI. 391. 1753. 



A shrub, 6 / -3 high, with few nearly erect branch- 

 es, and terete twigs. Leaves oblong or oblong-lan- 

 ceolate, mostly opposite, or verticillate in 3*3, obtuse 

 or sometimes acute at the apex, narrowed at the 

 base, petioled, glabrous, dark green above, light 

 green beneath, i / -2^ / long, 3 // -io // wide; young 

 twigs and petioles often slightly glandular; flowers 

 3 // -5 // broad, purple or crimson, numerous in lateral 

 compound or simple corymbs; pedicels filiform, 

 slightly glandular-canescent, 6 // -i2 // long, recurved 

 in fruit; sepals ovate, acute, canescent, persistent; 

 capsule depressed-globose, 5-lobed, canescent, 

 i>i // -2 // in diameter, the apex impressed; filiform 

 style long-persistent. 



In moist soil, in swamps or on hillsides, Newfound- 

 land to Hudson Bay, south to Georgia. Called also 

 Calf-kill and Sheep-poison. June-July. 



