162 HYDEOPHYLLACE^. Pkacelia. 



acute, coarsely and irregularly incised or pinnatifid ; the lower short-petiolulate and the 

 uppermost confluent : racemes loose, 7-20-flowered : pedicels spreading or in fruit recurved : 

 calyx-lobes linear, loose, longer than the globular capsule : corolla rotate-campanulate, 

 violet-blue, over half an inch in diameter, with rather short rounded lobes and very con- 

 spicuous internal appendages : stamens (bearded) and style usually more or less exserted. 

 — Fl. i. 134, t. 16 ; Gray, Man. ed. 8, 369. — Shaded banks of streams, Ohio and Illinois to 

 Alabama : flowering in June. 



Var. brevistylis, Gray. A remarkable form, with corolla about one half smaller : 

 style and especially the stamens not exserted. — P. brevistylis, Buckley, in Am. Jour. Soi. 

 xlv. (1843) 172. — Alabama, Buckley, Nevius, &c. 



§ 2. CosmXnthus, Gray. Ovules and seeds oi Euphacelia : corolla destitute 

 of internal appendages, almost rot9,te ; its lobes fimbriate : filaments (villous- 

 bearded) rarely longer than the corolla : ovary villous-hispid at the summit, 

 otherwise glabrous : low annuals, with loosely racemose flowers in the manner of 

 the last preceding species and of earliest of the next section. — Man. Bot. ed. 2, 

 828, & 5, 369. Gosmanthus, Nolte. Gosmanthus § Eucosmanthus, A.DC. in part. 



■ P. Plirshii, Buckley. A span to a foot high, diffusely branched from the base, sparsely 

 hirsute: cauline leaves pinnately 5-11-parted, the upper closely sessile ; lobes oblong or 

 lanceolate, acute : racemes rather many-flowered, sometimes forking ; calyx-lobes linear : 

 corolla light blue varying to white (half inch in diameter). — Buckley in Am. Jour. Sci. 

 xlv. 172 ; Gray, Man. 1. c. P. fimbriata, Pursh, &c. Cosmanthus Jimbriatus, Nolte, A.DC. 

 Prodr. ix. 297. — Moist wooded banks, W. Pennsylvania to Minnesota and Missouri, North 

 Carolina and Alabama. — Pedicels filiform, 6 to 10 lines long. Perhaps only a variety of 

 the next. Seeds as in the preceding. 

 P. flmbriata, Michx. Weak and diffuse, a span high, less hirsute : cauline 3-7-clef t or 

 lobed or the lower lyrately divided ; tlie lobes obtuse or roundish : racemes few-flowered : 

 pedicels filiform : calyx-lobes linear-oblong or spatulate : corolla white (only 3 or 4 lines 

 broad), rather shorter than the stamens. — Fl. i. 131; Gray, Man. 1. c. In woods of the 

 higher Alleghany Mountains, Virginia to Alabama ; flowering early. 



Var.? Bo^kini, Gray. More robust, evidently growing in more exposed soil : 

 racemes rather many-flowered, at length strict, with fruiting pedicels erect and not longer 

 tlian the caly.x : corolla far less fimbriate, bluish. — Proc. Am. Acad. x. .320. — Upper part 

 of Georgia, Boyhin. Perhaps a distinct species, more likely a state of P. fimbriata, growing 

 in a lower and warmer region. 



§ 3. CosMANTHOiDRS, Gray. Ovules and seeds 3 to 8 (rarely only a pair) on 

 each placenta, the latter with reticulated testa : appendages of the rotately or 

 open-campanulate corolla wanting, or very inconspicuous and remote from the 

 stamens : capsule globular and pointless : low annuals of the Atlantic United 

 States, early-flowering, hirsute-pubescent or glabrate, with mostly pinnatifid leaves, 

 the upper closely sessile, simply racemose flowers, and somewhat villous-bearded 

 filaments about the length of the blue or white corolla. 



* Ovules 2 to 4 on each (at length deciduous) placenta: globose capsule thin-walled; slender and 

 smoothish little annuals, witli the aspect of Cosmanthus, but lobes of the corolla entire, its base 

 with no appendages or only obscure vestiges. — Proc. Am. Acad. x. 320. 



P. glabra, Nutt. Slender, 3 to 8 inches high, glabrous except a few hirsute short hairs 

 chiefly on the margins of the leaves and calyx : corolla 3 or 4 lines in diaiueter : calyx- 

 lobes in fruit little longer than the capsule, mostly oblong or oval : otherwise as in P. par- 

 v! flora. — Trans. Amer. Phil. Soc. n. ser. v. 192 ; Gray, 1. c. — Low prairies, Arkansas and 

 Eastern Texas. Very like slender and smoother forms of the next, into which it probably 

 passes. Ovules 4 in some flowers, 5 to 7 or 8 in others. 

 * P. parviflora, Pursh. A span or more high, sparsely hirsute or glabrate, branched 

 from the base : radical and lowest cauline leaves lyrately pinnate, with 3 to 5 roundish 

 leaflets or divisions, or sometimes simple and entire ; the upper mostly sessile and .3-9- 

 parted or cleft into oblong or linear-lanceolate lobes : racemes loose, several-many-flowered ; 



