24 EUBIACE^. Bouvardia. 



Mag. t. 1854; Lindl. Bot. Reg. xxvi. t. 37. B. Jacquinl, HBK. 1. c. 385; DC. Prodr. iv. 

 365° Gray.Pl. Wright, ii. 67. B. quote niij'olia, DC. 1. c. 1 B. coccinea, Link, Enum. i. 139. 

 B. fernifoUa, Schlecht. in Linn. xxri. 98. B. splendens, Graham in Bot. Mag. t. 3781. Ixora 

 teruifhUa, Cav. Ic. iv. t. 305. I. Ain/rirana, Jacii. Hort. ,Sch(L'nb. iii. t. 257. Ifmislmiia mc- 

 cineu, Andr. Bot. Bep. t. 106. — Eocky ground, S. Arizona, &f., Wright, T/mrher, Rothrock, 

 Prinijle, Leiiimm. (Mcx.) 



Var. angustifolia. Cinereous-puLerulent or hii-tcUous : leaves smaller (8 to 18 lines 

 long), subsessile, less veiny, from oblong-lanceolate to almost linear. — B. hirtella & B. angus- 

 tifolia, HBK. 1. c. 384. B. hirtella, Gray, PI. Wriglit. i^ 80, ii. (;7. — S. V\'. Texas to Arizona, 

 Wright, &c. (Mex.) 



4. HOUSTONIA, Gronov. (Named by Gronovius, as says Limiaaus, in 

 iTiemory of Br. Win. Houston, who died in Jamaica in 17.'3:j. ) — Low herbs, 

 or one or two suffruticulose (Atlantic- American and Mexican), witli heterogone- 

 dimorphous flowers ; the corolla blue or purple to white, upper face of lobes 

 sometimes puberulous. — L. Hort. C'litf. oo, & Gen. ed. 1 (17;i7) ; Juss. Gen. l'.)7 : 

 Gray, Proc. Am. Acad. iv. 313, & Man. ed. r>. 212 ; Benth. & Hook. Gen. ii. (10. 

 Heeiijotis in part (Wight & Arn.), Torr. & Gray, Fl. ii. 36. {Macrohoustouia, 

 (Jrav, Proo. Am. Acad. iv. 314, is a peculiar group of Mexican species, between 

 this genus and Bouvardia.) 



§ 1. EunousTONiA. Low herbs, comparatively small-flowered : leaves not 

 rigid : capsule more or less didymous or emarginate, sometimes seiDticidal as well 

 as loculicidal across the broad summit. 



* Delicate species, inch to span high: coi'olla salverfomi: anthers or stigmas included or only p-ir- 

 tially emerging from the thr<iat : peduncles single, elongated and ei'ect in fruit : seeds ratlicr f^w 

 acetabuliform •witli a deep hilar cavity: stipules a transverse membrane uniting the petioles, 

 mostly entire or truncate and naked. 



H^ Perennial by delicate filiform creeping rootstocks or ci'eeping stems: peduncles filiform, inch or 

 twu long: seeds subglobose with orifice of the deep hilar cavity circular. 



. H. cserulea, L. (Bluets of the Canadians, Innocence.) Perennial by slender rootstocks, 

 forming small tnits, erect, a span or more high, glabrous, and "witli lower leaves liispidulous ; 

 these .spatulate to obo\ate and short-petioled ; upper small and nearly sessile : coroUa violet- 

 blue to lilac, vai-ying to white, with yellowish eye; tube (2 or 3 lines long) much exceeding 

 calyx-lobes, longer than or equalled by those of corolla: capsule oliccirdate-drpressed, half 

 free. — Spec. i. 105 (Moris. Hist. sect. 15, t. 4, f. 1 ; Pluk. ,\lm. &, Mant. t. 97. f. 9) ; Sims, 

 Bot. Mag. t. 370; Bai-tou, Fl. Am. JSej.t. t. .-34, f. 1. H. pusilla, Gmel. Syst. i. 236 i H. Liii- 

 mri, var. elatior, Michx. Fl. i. 85. //. sirjiyHi/dlin, Graham, Bot. Mag. t. 2822, from habitat 

 and figure, but corolla-tube too short. Hdh/nfis ccnilm, Hook. Fl. i. 280; Torr. & Gray, 

 Fl. ii. 38. II. gentiaiioitli's, Eudl. Iconogr. t. 89. Ohlmhiiidiu cceruka, Grav, M:m. ed. 2, 174. 

 — Low and grassy grounds, Canada to Jlichigan and the upper country of Georgia and 

 Alabama; H. early spring. 



.H. serpyllifolia, JIk.hx. Perennial by prostrate extensiicly creeping and rooting fili- 

 form stems, and some subterranean ones, glabrous or slightly and minutely hispidulous 

 below: leaves orl)icnlar to ovate or ovate-spatulate (2 to 4 lines long) and abruptly jietioled, 

 or upper ones on flowering stems oblong and neariy sessile : corolla deep violet-blue, rather 

 larger than in //. cce™/™. — Fl. i. 85; Pursh, Fl. 1. 106. II. tnielh, Pursh, 1. c. Iledyotis 

 seriJi/lli/oliu, Torr. & Gray, Fl. ii, 39. Olihiihiiitfia serin^llifuli.i. Gray, Man. od. 2; Chapm. 

 Fl. 180: — Along streamlets and on mountain-tojis in the .VUeglnuiies, from Virginia to 

 Tenn, and S, Carolina; flowering through e;irly sum 



inier. 



■^ -I-. Winter-annuals, branching from the simple root, glabrous or obscuridv scabrous: pedun- 

 cles a quarter-inch (o at length sometimes an iiul> long: capsule somewhat didymous, less than 

 half free: mature fcids generally as of the preceding. 



■ H. patens, Eel. An inch to at lengtli a S]ian high, with ascending branches and erect pe- 

 duncles : leaves sii.atnlate to ovate: eor.dla much smaller than that of //. caruha ; the tube 

 twice the length ...f the calyx-lobes and more or less longer than its lobes, \iolet-hlue or pur 



