PESCATORIA 



PETALOSTEMUM 



2561 



Leaves equitant, tufted, without pseudobulbs: fls. 

 solitary on sts. 3-6 in. long, from the axils of the Ivs., 

 mostly large and showy and fragrant; sepals and petals 

 broad, concave, spreading, the lateral sepals forming a 

 mentum; labellum clawed, lateral lobes small, middle 

 lobe rounded, spreading; crest thick, consisting of a 

 number of keels arranged in a semi-circle near the base 

 of the lip; column slender, not boat-shaped. About 

 12 species. For cult., see Zygopetalum. 



Klabochorum, Reichb. f. Lvs. strap-shaped, 1 ft. or 

 more long: fls. 3-3 K i n - across, variable in color; sepals 

 oblong, obtuse; petals shorter, all white with chocolate- 

 purple points; labellum 3-lobed, yellowish or white, and 

 having many purple-tipped hairs; callus sulfur-colored, 

 with brown keels. June, July. Ecuador. Gn. 22:24. 



Dayana, Reichb. f. Lvs. tufted, 6-10 in. long: fls. on 

 short scapes; sepals oblong-obovate, acute, white, with 

 green tips; petals rhomboid-rotund; labellum clawed, 

 angled on each side of the base; limb oblong, emargi- 

 nate, revolute on the sides, white with a callous ring 

 which is purple-violet, the base being of the same color; 

 column yellow, with a red band near the base and the 

 anther of the same color. Late autumn. Colombia. 

 Yar. rhodacra, Reichb. f. Sepals and petals with rose 

 tips; labellum orbicular, suf- 

 fused crimson. B.M. 6214. 



cerina, Reichb. f . Fig. 2877. 

 Lvs. in tufts of 4 or 5, cune- 

 ate-oblong, pointed, 1 ft. 

 long: peduncles 2-6 in. long, 

 1-fld. ; sepals and petals nearly 

 equal, the latter somewhat 

 clawed, fleshy, rounded, con- 

 cave, pale straw-color; label- 

 lum ovate, yellow, with a 

 thick semi - circular crest. 

 Chiriqui. B. M. 5598 (as 

 Huntleya cerina). F.S. 17: 

 1815 (as Zygopetalum ceri- 

 num). Flowers at various 

 seasons, the fls. lasting a long 

 tune. 



P. cochlfdris, Rolfe. Lvs. ob- 2877. Pescatoria cerina. 



lanceolate-oblong, acute, 5-9 in. 



long: sepals and petals nearly equal, lower halves ivory-white, 

 upper reddish maroon; lip 3-lobed, white; column maroon. Andes. 



HEIXRICH HASSELBRIXG. 



PETALOSTEMUM (Greek for petal and stamen, 

 alluding to the way in which these organs are 

 joined). Sometimes spelled Petalostemon. By some 

 authors, the species have been referred to Kuhnistera. 

 Leguminbsx. American herbs, mostly western, with 

 long or deep perennial roots, sometimes planted for 

 ornament. 



Leaves glandular, alternate; blades unequally pin- 

 nately compound; Ifts. often broadest above the middle 

 and involute: fls. perfect, in short or elongated spikes; 

 calyx-teeth nearly equal, rather broad, shorter than 

 the tube; corolla white, pink, purple, or violet; petals 

 on long slender claws; standard oblong or obcordate; 

 wings and keel-petal similar, their claws adnate to the 

 sheath of the stamen-tube almost to its summit; sta- 

 mens 5, monadelphous, alternate with the petals; 

 ovary sessile, 2-ovuled; style subulate: pod included in 

 the calyx, mostly dehiscent, 1-2-seeded. Distinguished 

 from its close relative Dalea by having only 5 stamens 

 instead of 9-10 as in that genus. About 27 species. 

 These low bushy plants with fine-cut Ivs. and bearing a 

 constant succession of showy spikes of fls. are very 

 attractive, and well adapted for borders and rock- 

 gardens. 



A. Fls. white. 



candidum, Michx. (Dalea Candida, Willd.). WHITE 

 PRAIRIE CLOVER. Plants glabrous: sts. erect or rarely 

 prostrate, simple or sparingly branched, 1-2 ft. tall: 



Ifts. 5-9, the blades linear, oblong or oblanceolate, 

 Yy-\y% in. long, acute, or mucronulate, glandular 

 beneath, more or less cuneate at base, very short- 

 stalked: peduncles terminal, elongated, bracted; spikes 

 cylindric, 1-4 in. long, about J^in. thick; bracts 

 aculeate, longer than the calyx; corolla white, 2-3 lines 

 long; wings and keel oval; standard cordate; calyx- 

 teeth and pod slightly pubescent. Term, to Minn., La., 

 and Texas. B.B. 2 (ed. 2): 369. 



AA. Fls. rosy purple or violet. 

 B. Pubescence of the calyx of short close-set oppressed 



hairs. 



decumbens, Nutt. Plants sparingly pubescent above 

 or glabrate: sts. solitary or cespitose, ascending or 



decumbent, 1-2 ft. tall, 

 mostly simple: Ifts. 5-7, 

 linear or linear-oblong, %- 

 %in. long, acute or mucro- 

 nulate, glandular, often 



involute: spikes ovoid or oblong, %-%in. long; 

 bracts ovate-lanceolate, with subulate tips; calyx 

 strigillose, shorter than the bracts, tube campanu- 

 late, lobes lanceolate or ovate-lanceolate, shorter than 

 tube, acute; corolla pink or rose-purple; standard with 

 an oblong-ovate cordate blade, other petals with oblong 

 blades. N. E. Texas. 



BB. Pubescence of the calyx vittous or sdky-vittous. 

 c. Bracts glabrous or merely pubendent tips. 



purpureum, Rydb. (Dalea purpurea, Vent. P. viold- 

 ceum, Michx.). VIOLET PRAIRIE CLOVER. Glabrous or 

 slightly pubescent, erect, 13^-3 ft. high, branching 

 above: Ivs. short-petioled; Ifts. 3-5, narrowly linear, 

 M-Mia- long, ^-1 line wide, acute or mucronate at 

 the apex, narrowed at the base, shortnstalked: spikes 

 peduncled, oblong to cylindric, ^-2 in. long, about 

 Hin. thick; bracts above mucronate, nearly glabrous, 

 nearly equaling the pubescent calyx; corolla violet to 

 purple, about 2 lines long; standard cordate, wings 

 and keel oblong. Ind. to Sask. and Texas. B.M. 1707. 

 B.B. 2 (ed. 2): 370. 



cc. Bracts with silky-pubescent tips. 

 tenuifdlium, Gray. SILKY PRAIRIE CLOVER. Erect, 

 somewhat pubescent, branching, 1-2 ft. high: Ivs. 

 short-petioled; Ifts. 3-5, linear, obtuse, glandular- 

 dotted, margin somewhat involute, ^-^in. long, 

 nearly sessile: spikes cylindric, %-!% in. long, about 

 %in. thick; rachis pubescent; fls. rose-purple, about 

 J^in. long; bracts ovate-pointed, pubescent, equaling 

 the calyx; standard somewhat orbicular to cordate. 

 Kans. to New Mex. B.B. 2 (ed. 2) :370. 



P. L. RICKER. 



