292 MISC. PUBLICATION 303, U. S. DEPT. OF AGRICULTURE 
Var. foliosifloj'a (Michx.) Fern., (Arsenococciis frondosus (Pursti) Small, 
XoJisma foliosiflofa Small, Lyonia frc-Jidosa Piirsh) is commoner southward. 
Observations: Ignored by white-tailed deer in Massachusetts. 
Xolisma lucida (Bartr.) Rehd. Fetter t)ush. 
Lyonia nitida (Bartr.) Fern., Pieris nitida Benth. and Hook., Desmothammis 
lucidus (Lam.) Small, :N'eopieris nitida (Bartr.) Britt. 
Range: 29, 80. 
Site : Well-drained, moist, sun, shade. 
Fruit : Capsule. 
A small to large evergreen shrub ; flowers April-May. 
Xolisma mariana (L.) Rehd. Staggerbush. 
Lyonia mariana (L. ) Don., Neopieris mariana (L.) Britt.. Pieris mariana 
(L.) Benth. and Hook. 
Range : 20, 27, 28, 29, 30. 
Site: Well-drained, moist. 
Fruit: Capsule. 
A small shrub ; flowers May-July ; occurs in sandy soil. Foliage said to be 
poisonous to lambs and calves. 
Zylococcus bicolor, see Arctostapliylos hicolor. 
Xylosteon ciliatiim, see Lonicera canadensis. 
Xylosteon conjugiale, see Lonioera conjugialis. 
Xylosteon involucrata, see Lonicera involucrata. 
Xylosteon utahensis, see Lonicera utakensis. 
Xylosteon villosnm, see Lonicera villosa. 
Xylosteon oblongifolia, see Lonicera oNongifoIia. 
Xylothermia montana, see Pickeringia montana. 
Yucca spp. (pi. 44). 
Generally slow-growing, simple-stemmed, treelike species often with very 
long roots ; commonly occur in dry, sterile soils ; stems commonly grow to 
keep pace with shifting sands ; trunks occasionally used in construction ; pol- 
lination rarely occurs unless a small white moth gathers the poUen and pushes 
it into the stigmatic tube, the larvae feeding exclusively on maturing seeds 
of the plant. Propagation is by seed, offsets, stems, or rhizome cuttings. 
Storiiacli records (in addition to specific records) : Band-tailed pigeon; wild 
turkey. 01)servations (in addition to specific records) : Baccate fruit commonly 
eaten by birds and mammals ; jack rabbit, rusty antelope squirrel, gray-tailed 
antelope squirrel, black-backed rock squirrel, mexican mule deer. Nearly all 
species are eaten by livestock if the tender parts are within reach. Some 
are of importance as honey plants. 
Zanthoxylum, see Xantlioxylum. 
Zenobia cassinefolia (Vent.) Poll. 
Andromeda cassinefolia Vent. 
Range: 29, 30. 
Site: Well-drained, sun, shade. 
Fruit: Capsule. 
A small to large shrub. 
Zenobia pulverulenta (Pai'tr.) Poll. Zenobia. 
Andromeda pulverule^ita Bartr. 
Range: 29. 30. 
Site : Well-drained, sun, shade. 
Fruit: Capsule. 
A small to large shrub ; occurs on sandy and other soils. 
Zizyphns lycioides, see Condalia lycioides. 
Zizyphus obtu'sifolia, see Condalia ohtusifolia. 
Zizyphus parryi. see Condalia parry i. 
Zygia brevifolia, see Pithecololiiim orevifolium. 
Zygia flexicaulis, see PitJiecoloMum flexicaxde. 
