Vor. II.] HEATH FAMILY. 563 
7. CHAMAECISTUS OKEder, Fl. Dan. A/. 9. 1761. 
[LOISELEURIA Desy. Journ. Bot. (II) 1: 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. 
1. Chamaecistus procumbens (L.) Kuntze. 
Alpine or Trailing Azalea. (Fig. 2755.) 
Azalea procumbens I,. Sp. Pl. 151. 1753. 
Loiseleuria procumbens Desv. Journ. Bot. (II) 1: 35. 1813. 
CG. serpyllifolia S. F. Gray, Bot. Arr. Brit. Pl. 2: 401. 1821. 
Chamaecistus procumbens Kuntze, Rev. Gen. Pl. 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 14’ 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 1/ 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 LI. Sp. Pl. 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 1o-keeled in the bud, 5-lobed, with 10 pouches below the limb, the keels 
extending from the pouches to the lobes and sinuses. Stamens Io, 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 10-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. . angustifolia. 
Leaves elliptic or oval, acute at both ends; flowers 8’’-12'' broad. K. latifolia, 
I. 
2. 
Flowers in simple terminal umbels; twigs 2-edged. 3. K. glauca. 
Flowers mostly solitary in the axils; leaves and twigs hirsute. 4. K. hirsuta. 
1. Kalmia angustifolia L. Sheep-laurel. 
Lambkill. Wicky. (Fig. 2756.) 
Kalmia angustifolia I,. Sp. Pl. 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’s, obtuse 
or sometimes acute at the apex, narrowed at the 
base, petioled, glabrous, dark green above, light 
green beneath, 1/-214/ long, 3/’-10’’ 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’/-12’’ long, recurved 
in fruit; sepals ovate, acute, canescent, persistent; 
capsule depressed-globose, 5-lobed, canescent, 
114//-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. 
