18 



EUPHORBIACEAE— ERICACEAE 



Xanthoxylum — Prickly Ash 

 (Gr. xanthos, yellow, xylon, wood) 

 Small tree; leaves pinnate, leaflets 5-11; flowers greenish X. americdnum 



Euphorbiaceae — Spurge Family 



Herbs with monoecious flowers; sepals 0, petals 0. stamen 1, pistil 3-parted, several staminate 

 and one pistillate flower enclosed by an involucre bearing glands often resembling petals. 



Euphorbia — Spurge 



(Gr. euphorbion, spurge) 

 PL 6, fig. E and F: 1, 2 



1. Glands of the involucre with conspicuous petal-like appendages E. corolldta 



2. Glands without petal-like appendages E. cyparissias 



Ericales Heath Order 



Ericaceae — Heath Family 

 Herbs or shrubs with simple leaves, usually evergreen ; sepals 4-5, petals 4-5, stamens 4-10. 

 ovary 2-5-cclled ; flower syncarpous, apopetalous, sympetalous, hypogynous or epigynous. regular. 



I. Low herbs with basal leaves only Pirola 



II. Leafy shrubs 



1. Flower hypogynous, i. e., ovary within the corolla 



a. Petals separate Ledum 



b. Petals united 



(1) Corolla saucer-shaped Kahnia 



(2) Corolla bell-shaped or cylindric 



(a) Erect shrubs 



x. Stamen filaments bearded 

 y. Stamen filaments smooth 



(b) Trailing shrubs 

 x. Corolla salverform 

 y. Corolla cylindric 



2. Flower epigynous, i. e., ovary below the corolla 



a. Petals nearly or quite free 



b. Petals clearly united 



(1) Ovary half-inferior; low trailing shrub 



(2) Ovary inferior; erect shrub 



Pirola — Wintergreen 



(L. pirum, pear, referring to the leaves) 

 PI. 7, fig. A 



1. Flowers greenish white, style straight 



2. Flowers rose or purple, style bent 



Ledum — Labrador Tea 



(Gr. ledon, an oriental shrub) 

 Evergreen shrub with simple entire leaves; flowers white 



Kahnia — Swamp Laurel 



(Xamed for Peter Kalm) 

 Evergreen shrubs with purple flowers K. glduca 



Andromeda — Moorwort 



i Named from Andromeda) 



Evergreen shrub with linear leaves; white flowers in umbels A. polifolia 



Chamaedaphne — Leatherleaf 



(Gr. chamae, on the ground, Daphne) 

 Leaves oblong, scurfy, denticulate; flowers white, in 1-sided racemes C. calyculdta 



Epigaea — Trailing Arbutus 



(Gr. epigeios, on the earth) 

 Leaves oval : flowers rose-colored E. ripens 



Arctostaphylus — Bearberry 



(Gr. arctos, bear, staphyle, grape) 

 PL 7, fig. B: 1, 2 

 Leaves spatulate; flowers white or pinkish A.uva-ursi 



Andromeda 

 Chamaedaphne 



Epigaea 

 Arctostaphylus 



Oxycoccus 



Chio genes 

 Vaccinium 



P. secunda 

 P. asarifoiia 



L. groenldndicum 



