ZYGOPHYLLACEAE. 201 



4. Cathartolinum Bracei Small, N. A. Fl. 25: 75. 1907. 



Annual, pale green or glaucescent, glabrous; stem corymbosely branched 

 above, 1.5-3.5 dm. high, somewhat striate, the very slender branches ascending. 

 Leaves few and distant, ascending, rather thin, spatulate to linear-oblong, (5-14 

 mm. long, acute, entire, ciliate, only the lower opposite; bracts lanceolate, 

 glandular-toothed; outer sepals oval to ovate-oblong, acute, 3.5-4 mm. long, 

 glandular-toothed, the inner similar, slightly shorter; petals yellow; filaments 

 pubescent below the middle; staminodia deltoid, glabrous; styles distinct; 

 capsule depressed, about 2 mm. long. 



White-lands and moist situations, Abaco and Great Bahama. Endemic. 

 Brace's Flax. 



5. Cathartolinum lignosum Small, N. A. Fl. 25: 75. 1907. 



Apparently perennial; stem woody, branched, with long, prominently 

 striate branches, 3 dm. high. Leaves numerous, but not crowded, linear or nearly 

 so, 4-11 mm. long, sessile, acuminate, glandular-eiliate; outer sepals ovate, 

 3-3.5 mm. long, glandular-toothed, acuminate, the inner broader than the outer; 

 petals yellow; filaments and staminodia glabrous; styles distinct. 



Scrub-lands under low bushes in partial openings, Great Bahama at Eight 

 Mile Bocks. Endemic. WOOD* Flax. 



A species of Linum, perhaps L. Leuisii Pursh, was collected by Mr. Brace in 

 foliage only on New l'rovidence in 1916. 



Family 4. ZYGOPHYLLACEAE Lindl. 



Caltrop Family. 



Herbs, shrubs, or some tropical species trees, the branches often jointed 

 to the nodes. Leaves mostly opposite, stipulate, pinnate, or 2-3-foliolate, 

 the leaflets entire. Stipules persistent. Flowers perfect, axillary, pe- 

 duncled. Sepals usually 5, distinct, or united by their bases. Petals the 

 same number as the sepals, or none. Stamens as many as the petals, or 

 2-3 times as many, inserted on the base of the receptacle, the alternate ones 

 sometimes longer; anthers versatile, longitudinally dehiscent; filaments 

 usually with a small scale at the base or near the middle. Ovary 4-12- 

 eelled; style terminal; stigma usually simple; ovules 1-numerous in each 

 cavity, pendulous or ascending. Fruits various, dry or quite fleshy. 

 About 20 genera and 160 species, widely distributed in warm and tropical 

 regions. 



Trees or shrubs; flowers blue or purple. 1. Quaiocum. 

 Herbs : flowers yellow. 



Carpels spinose. -'. Tribulus. 



Carpels tuberculate. 3. Kallstroemia, 



1. GUAIACUM L. Sp. PI. 3S1. 17:.::. 



Evergreen trees or shrubs, with hard resinous wood, the branches stout, 

 the nodes often swollen. Leaves opposite, petioled, abruptly pinnate, the 

 leaflets 2-several pairs, entire, inequilateral, reticulate-veined, the stipules 

 minute. Flowers clustered, peduncled, the peduncles subtended by minute 

 deciduous bracts. Sepals 4 or 5, somewhat united at the base. Petals 4 or 5, 

 blue or purple. Stamens 8 or 10; filaments filiform; anthers cordate or ^-a^it- 

 tate. Ovary stalked, 2-5-lobed, 2-5-celled; style subulate; ovules 8-10 in each 

 cavity, anatropous. Fruit coriaceous, with 2-5 wing-like angles. Sc< ids ovoid 



14 



