medium-length processes; styles slender, much longer than the ovary; capsule 

 subglobose, with a thickened ridge or collar about the interstylar aperture, com- 

 monly with glandlike cells, enveloped at the top by the withered corolla. 



Through the cen. states from Ut. and Colo., e. to s.w. Ind., Okla. (Ottawa 

 Co.) and Tex., parasitic on a number of different species of herbaceous hosts 

 but seems to prefer members of the Compositae including species of Ambrosia, 

 Baccharis, Helianthus, Iva and Liatris. 



15. Cuscuta squamata Engelm. Fig. 643. 



Flowers about 3 mm. long from base to corolla sinuses, sessile, in scattered 

 few- to several-flowered glomerules, or these densely clustered about the host, 

 subtended by 2 to several ovate acute often cuspidate serrulate closely appressed 

 bracts that are mostly shorter than the calyx; calyx lobes distinct or nearly so, 

 ovate, acute, often cuspidate, closely appressed and widely overlapping at base, 

 commonly serrulate, with pellucid glandlike cells along the middle; corolla lobes 

 ovate-lanceolate or slightly oblong, acute, sometimes cuspidate, shorter than the 

 tube, spreading to reflexed, more or less glandular along the middle; scales about 

 reaching the filaments, oblong, fringed with medium-length processes; styles 

 slender, longer than the ovary; capsule globose to subconic, more or less umbonate, 

 carrying the withered corolla about the top. 



Rare in Tex. in the Trans-Pecos, Plains Country and Hardin Co. in s.e. Tex.; 

 also s. N.M. (Dona Ana and Chaves cos.) and n. Mex.; parasitic usually on various 

 weedy species of Compositae, such as Helianthus ciliaris. 



16. Cuscuta compacta Juss. Fig. 641. 



Flowers often greenish, to 4.5 mm. long from base to corolla sinuses, sessile 

 or rarely short-pedicellate, in few- to several-flowered scattered glomerules, or 

 these commonly closely clustered about the host, frequently originating endo- 

 genously and forming a dense ropelike cluster about the stem of the host, 

 subtended by 2 to several ovate-orbicular fleshy tightly appressed bracts; calyx 

 deeply divided; calyx segments distinct or nearly so, broadly overlapping, fleshy, 

 cupped, rounded, obtuse, tightly appressed about corolla, the margins fringed 

 with short slender filamentous processes; corolla lobes spreading to reflexed, 

 much shorter than the tube, oval-oblong, rounded, obtuse, sometimes fringed with 

 short filamentous processes; scales reaching the filaments, fringed with long 

 processes, small secondary scales often present on the bridge between the larger 

 ones; styles mostly longer than the ovary; capsule globose-conic, upper part with 

 glandlike cells and capped by the withered corolla, thickened at the top about the 

 interstylar aperture. 



Extending from N.E. to Fla. and w. to Mo., s.e. Okla. (McCurtain and Leflore 

 COS.) and Tex.; parasitic on a wide range of herbaceous and woody hosts including 

 species of Carya, Alnus, Maf^nolia, Rubus, Rosa, Rhus, Ilex, Acer, Vitis, Cissus, 

 Clethra, Vaccinium, Tecoma, Cyrilla, Cephalanthus, Lycopus, Myrica and Boeh- 

 meria. 



Fam. 112. Polemoniaceae Juss. Phlox Family 



Perennials, biennials, annuals or rarely subshrubs; leaves either all alternate or 

 opposite, or opposite below and becoming alternate up the stem, undivided to 

 pinnately compound or rarely palmately dissected or lobed, the margin entire to 

 toothed; inflorescence of sparse cymes or glomerules in corymbose or paniculate 

 disposition, sometimes a solitary flower; flowers regular or sometimes irregular; 

 sepals 5, partly united into a herbaceous or scarious calyx; petals 5, convolute in 

 bud, partly united into a rotate, campanulate, funnelform or salverform corolla; 



1369 



