Exhibit 21.1

SUBSIDIARIES OF THE COMPANY

as of December 31, 2009

Subsidiaries			State or Jurisdiction of Organization
Pioneer Natural Resources USA, Inc.			Delaware
DMLP CO.			Delaware
Long Canyon Gas Company, LLC	(75.4	%)	Colorado
Lorencito Gas Gathering, LLC	(85	%)	Colorado
Mesa Environmental Ventures Co.			Delaware
Petroleum South Cape (Pty) Ltd.			South Africa
Pioneer JDZ Limited			Nigeria
Pioneer Natural Gas Company			Texas
Pioneer Natural Resources Alaska, Inc.			Delaware
Pioneer Natural Resources Algeria Limited			Cayman Islands
Pioneer Natural Resources Anaguid Ltd.			Cayman Islands
Pioneer Natural Resources Foundation			Texas
Pioneer Natural Resources GP LLC			Delaware
Pioneer Natural Resources Morocco Limited			Cayman Islands
Pioneer Natural Resources South Africa (Pty) Limited			South Africa
Pioneer Natural Resources (Tierra Del Fuego) S.R.L.			Argentina
Pioneer Natural Resources Tunisia Ltd.			Cayman Islands
Pioneer Natural Resources UK Limited			England
Pioneer Natural Resources West Africa Limited			Cayman Islands
Pioneer Natural Resources Equatorial Guinea Limited			Cayman Islands
Pioneer Nigeria Deepwater Limited			Nigeria
Pioneer Resources Africa Limited			Cayman Islands
Pioneer Natural Resources Nigeria Ltd.			Cayman Islands
Pioneer NR Nigeria (256) Limited			Nigeria
Pioneer Resources Gabon Limited			Bahamas
Pioneer Southwest Energy Partners L.P.	(61.9	%)	Delaware
Pioneer Southwest Energy Partners USA LLC			Delaware
PSE Finance Corporation			Delaware
Pioneer Uravan, Inc.			Texas
Sendero Holding Company, LLC			Delaware
Sendero Drilling Company, LLC	(90	%)	Delaware
STAT Land Co.			Texas
Westpan Limited NGL LLC			Texas
Westpan Limited Resources LLC			Texas
Pioneer International Resources Company			Delaware
LF Holding Company LDC			Cayman Islands
Parker & Parsley Argentina, Inc.			Delaware
TDF Holding Company LDC			Cayman Islands
Pioneer Shelf Properties Incorporated			Delaware
Partnerships in which Pioneer Natural Resources USA, Inc. is the managing general partner:
Parker & Parsley 87-A Conv., Ltd.			Texas
Parker & Parsley Private Investment 88 L.P.			Delaware
Parker & Parsley Private Investment 89, L.P.			Delaware
Parker & Parsley 90 Spraberry Private Development, L.P.			Delaware
Midkiff Development Drilling Program, Ltd.			Texas
Mesa Offshore Royalty Partnership			Texas

Notes:

1. Indented names are subsidiaries of subsidiaries.

2. Inclusion in the list is not a representation that the subsidiary is a significant subsidiary.

3. Except as noted, the voting shares of all subsidiaries are 100% owned by Pioneer Natural Resources Company or its subsidiaries.