to sometimes white; corolla lobes about as long as or shorter than the calyx lobes, 

 obovate to oblong, obtuse; stigmatic lobes greenish, 2.5-4 mm. long; capsule to 

 9 mm. long. S. carnosa Small. 



On beaches, depressions in dunes, salt flats, fields and wet savannahs in s. Tex,, 

 Apr.-July; in La., Tex. and n.e. Mex. 



6. Sabatia calycina (Lam.) Heller. 



Rigidly erect perennial with a slender or thick rhizome, to 4 dm. tall; stems 

 weak, simple or with either opposite or alternate divergent or somewhat ascend- 

 ing branches; leaves membranous, oblong to narrowly obovate, obtuse to acute, 

 to 1 dm. long and 2 cm. wide; flowers usually borne singly, 5- or 6-merous; 

 calyx tube thin, smooth or with the veins only slightly elevated, to 5 mm. long, 

 its thin foliaceous lobes oblanceolate to spatulate and to 3 cm. long; corolla white 

 or pale-rose to pink; corolla lobes oblanceolate to spatulate or elliptic, obtuse 

 or acute, to 15 mm. long and 6 mm. wide; stigmatic lobes 4-6 mm. long; capsule 

 to 1 cm. long and 8 mm. in diameter. 



Ditches and shaded river swamps and bottoms in s.e. Tex., June-July; from 

 s.e. Va., s. to Fla. and Tex.; also Cuba and Hisp. 



2. Centaurium Hill Centaury 



Mostly low and small branching annuals but sometimes tall and showy; leaves 

 opposite; flowers light-pink to rose-purple or reddish; calyx 4- or 5-parted, the 

 lobes slender and appressed to the corolla tube; corolla funnelform or salverform, 

 with slender tube and 4- or 5-parted limb; anthers exserted, erect, spirally twisting; 

 style slender, single; stigma capitate or bifid. 



A genus of about 45 species in temperate regions of the world. 



1. Corolla lobes 7 mm. or more long, about as long as the corolla tube (2) 



1. Corolla lobes rarely more than 6 mm. long, shorter than the corolla tube (4) 



2(1). Some of the leaves oblong or oblong-elliptic; corolla tube and calyx lobes 

 about equal in length 1. C calycosiim var. calycosum. 



2. All leaves typically linear; corolla tube conspicuously exceeding the calyx lobes 



(3) 



3(2). Plant without minute glands 2. C. Beyrichii var. Beyrichii. 



3. Plant (especially the leaves) densely covered with minute glands 



2. C Beyrichii var. glanduliferum. 



4(1). Distribution in central and southern Texas 



L C. calycosum var. breviflorum. 



4. Distribution in New Mexico and/or Arizona (5) 



5(4). Basal leaves several approximate to form a basal rosette, obovatish, much 



wider than the cauline leaves; corolla lobes 4-6 mm. long 



3. C. nudicaule. 



5. Basal leaves well-spaced, not forming a basal rosette, similar in shape and 



size to the cauline leaves; corolla lobes 3-4 mm. long 



4. C exaltatum. 



1. Centaurium calycosum (Buckl.) Fern. var. calycosum. Rosita. Fig. 626. 



Plant erect, simple or corymbosely branched, to 6 dm. tall, usually much 

 smaller; cauline leaves oblong to oblong-elliptic or sometimes narrowly lanceolate, 

 to 6 cm. long and 13 mm. wide; pedicels equaling or sometimes exceeding the 

 calyx; flowers pink to rose-color, rarely white; corolla tube about equaled in 

 length by the oblong to obovate or oval lobes (7-13 mm. long) and the calyx 

 lobes; seeds light-brown. Erythraea calycosa Buckl. 



1317 



