anthers and biglandular at base, a fourth inner row reduced to staminodes; anthers 

 4-celled and 4-valved; drupes subglobose, dark-blue or blackish, about 1 cm. long, 

 1 -seeded. P. pubescens (Pursh) Sarg., P. palustris (Raf.) Sarg. 



In woods, swamps, along streams and about seashores in s.e. Tex., May-June; 

 from Fla. to Tex., n. to Del. 



2. Cassytha L. 



About 15 species, mainly tropical and subtropical. 



1. Cassytha filiformis L. Woe-vine, love-vine. 



Parasitic vine superficially resembling Cuscuta, with yellowish or palegreen wiry 

 entwined stems and branches with a spicy fragrance; leaves wanting or reduced to 

 spirally arranged scales; flowers perfect, subtended by a minute bract and 2 similar 

 bracteoles, 2 to several at irregular intervals in a slender spike; sepals 6, in 2 

 unequal series, topping the accrescent fruit; the several inner sepals triangular- 

 ovate, about 1.5 mm. long, much larger than the outer bractlike sepals; fertile 

 stamens 9 in 3 rows, the innermost 3 with extrorse anthers and basal glands, a 

 fourth inner row reduced to 3 cordate staminodia; anthers 2-celled and 2-valved; 

 drupe globose, blackish, to about 7 mm. in diameter. 



Parasitic on various herbaceous and woody plants mostly in marsh areas along 

 coastal Tex., rare, May-July; from Fla. and Tex.; also Latin Am. and Afr. 



Fam. 64. Cruciferae Juss. Mustard Family 



Herbs with watery and mostly pungent sap, infrequently suffrutescent and sub- 

 shrubby; leaves alternate (rarely opposite), entire to lobed or pinnately divided 

 and without stipules; flowers bisexual, usually tetradynamous, mostly regular and 

 ebracteate in terminal racemes, infrequently solitary and pedunculate; sepals 4, 

 deciduous, usually oblong, erect and appressed to the corolla or spreading at 

 anthesis; petals 4 (rarely absent), hypogynous, entire or emarginate, rarely lobed 

 or fimbriate, yellow, white or lavendar; stamens 6 (rarely fewer or more) in two 

 whorls, outer single stamens 2, inner paired stamens 4; ovary with 2 locules (rarely 

 with a single locule); fruit a dry usually dehiscent silique with a wide range of 

 shapes from narrowly linear to depressed-globose; seeds without an endosperm; 

 embryo curved with radicle usually folded retrorsely along cotyledon margins 

 (accumbent), or along the back of one cotyledon (incumbent), or in a somewhat 

 intermediate position; embryo rarely straight as in Leavenworthia. 



About 375 genera and over 3,000 species. Nearly cosmopolitan, but mostly in 

 the temperate and cold parts of the world. At high elevations elsewhere. Many 

 species have become widespread weeds. 



1. Siliques of a linear or elliptic type, at least 3 times longer than broad (2) 



1. Siliques variously shaped from globose to orbicular or triangular, sometimes 



shortly ellipsoid, didymous or flattened, less than 3 times longer 

 than broad (19) 



2(1). Siliques with a transverse partition, indehiscent except by breaking into 

 jointed segments 10. Cakile 



2. Siliques dehiscent by longitudinal linear valves (3). 



3(2). Siliques flattened parallel to the septum (4) 



3. Siliques terete or (if compressed) flattened contrary to septum (11) 



4(3). Stems arising from a basal rosette of leaves or a branched caudex, or with 

 rhizome leaves present (5) 



4. Stems with lower leaves separated by internodes, no basal rosette or tuft of 



leaves present (10) 



962 



