ERICACEAE. 70 1 



didymous, dorsally attached to the filaments, longitudinally dehiscent. Disk ob- 

 scurely 5-lobed. Ovary globose; style short; stigma capitate; ovules numerous. 

 Capsule subglobose, 2-3-valved, the valves 2-cleft. Seeds ovoid, the testa granu- 

 lar. [Greek, ground cistus.] A monotypic genus. 



1. Chamaecistus procumbens (L.) Kuntze. Alpine or Trailing Azalea. 

 (I. F. f. 2755.) Tufted, diffuse; branches 5-10 cm. long. Leaves mostly opposite, 

 crowded, dark green above, paler beneath, 4-8 mm. long, the midrib very promi- 

 nent on the lower side, the margins strongly revolute; petioles I mm. long or less; 

 flowers 1-5 from terminal coriaceous buds; pedicels 6-8 mm. long; corolla pink or 

 white, about 4 mm. high, longer than the purplish sepals; capsule about 2 mm. in 

 diameter. Summits of the White Mts. ; Mt. Albert, Quebec; Lab. and Alaska. 

 Also in northern Europe and Asia. July-August. 



8. KALMIA L. 



Erect shrubs, with entire evergreen coriaceous leaves. 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 

 io-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; 

 anther-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; stigma depressed-capitellate. Capsule subglobose, obscurely 

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

 by Linnaeus to his pupil, Peter Kalm, 17 15-1779, who travelled in America.] 

 Seven known species, 6 of N. Am., the other Cuban. 



Flowers in mostly compound umbels or corymbs; twigs terete. 



Leaves oblong, mostly obtuse; flowers 6-10 mm. broad, 1. K. angustifolia. 



Leaves elliptic or oval, acute; flowers 16-25 mm. broad. 2. K. lati/olia. 



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. (I. F. f. 2756.) 

 Leaves mostly opposite, or verticillate in 3's, obtuse or sometimes acute, nar- 

 rowed at the base, petioled, glabrous, dark green above, light green beneath, 2.5-6.5 

 cm. long, 6-22 mm. wide; flowers purple or crimson, in lateral compound or simple 

 corymbs; pedicels filiform, 12-24 mm. long, recurved in fruit; sepals ovate, acute, 

 canescent, persistent; capsule depressed-globose, 5-lobed, canescent, 3-4 mm. in 

 diameter, the apex impressed; filiform style long-persistent. In moist soil, Newf. 

 to Hudson Bay, south to Ga. and Mich. June-July. 



2. Kalmia latifolia L. American or Mountain Laurel. Calico-bush. 

 (I. F. f. 2757.) Often forming dense thickets, becoming a tree; branches very stiff. 

 Leaves alternate, or some of them opposite, or rarely verticillate in 3's, petioled, 

 glabrous, flat, green on both sides, persistent, 5-13 cm. long, 12-35 mm - wide; 

 flowers pink to white, numerous and showy in compound terminal corymbs; ped- 

 icels bracted and 2-bracteolate at the base, 12-35 mm. long, glandular, erect, even 

 in fruit; capsule depressed-globose, 5-lobed, glandular. 4-6 mm. in diameter; calyx 

 and style long persistent. In woods, N. B. to Ont., Ohio, Fla. and La. May-June. 



Kalmia latifblia myrtifblia Rand. Low, compactly much branched ; leaves not 

 over 4 cm. long and 6-8 mm. wide. Mass. 



3. Kalmia glauca Ait. Pale or Swamp Laurel. (I. F. f. 2758.) Gla- 

 brous, 1.5-6 dm. high. Leaves opposite or sometimes in 3's, nearly sessile, ob- 

 long or linear-oblong, green above, white-glaucous beneath, 12-50 mm. long, 4-12 

 mm. wide, the margins revolute; flowers few (1-13), purple, 10-18 mm. broad; 

 pedicels filiform, 12-35 mm - l° n g' erect > even in fruit; sepals ovate, scarious- 

 margined, persistent; capsule depressed-globose, glabrous, about 5 mm. in diam- 

 eter. In bogs, Newf. to Alaska, Conn., X. J.. Pcnn., Mich, and Cal. Summer. 



4. Kalmia hirsuta Walt. Hairy Laurel. (I. F. f. 2759.) Branching, 3-6 

 dm. high, the branches ascending. Leaves oblong or oblong- lanceolate, nearly 

 sessile, villous-hirsute, becoming glabrate in age. dark green above, lighter beneath, 

 6-12 mm. long; flowers rose-purple, 10-18 mm. broad; pedicels slender, nearly or 



